| 
                                Jun 2019
                             | 
                            
                                
                                    Columbia Emerging Markets Fund
                                
                             | 
                            
                                1,903,604
                             | 
                            
                            
                                2.07%
                             | 
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                        
                                         | 
                                    
                                    
                                        
                                         | 
                                    
                                
                                
                        
                        
                            | 
                                Mar 2019
                             | 
                            
                                
                                    Columbia Emerging Markets Fund
                                
                             | 
                            
                                1,903,604
                             | 
                            
                            
                                2.08%
                             | 
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                        
                                         | 
                                    
                                    
                                        
                                         | 
                                    
                                
                                
                        
                        
                            | 
                                Dec 2018
                             | 
                            
                                
                                    Columbia Emerging Markets Fund
                                
                             | 
                            
                                1,903,604
                             | 
                            
                            
                                2.08%
                             | 
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                        
                                         | 
                                    
                                    
                                        
                                         | 
                                    
                                
                                
                        
                        
                            | 
                                Sep 2018
                             | 
                            
                                
                                    Columbia Emerging Markets Fund
                                
                             | 
                            
                                1,903,604
                             | 
                            
                            
                                2.08%
                             | 
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                        
                                         | 
                                    
                                    
                                        
                                         | 
                                    
                                
                                
                        
                        
                            | 
                                Jun 2018
                             | 
                            
                                
                                    Columbia Emerging Markets Fund
                                
                             | 
                            
                                1,903,604
                             | 
                            
                            
                                2.09%
                             | 
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                        
                                         | 
                                    
                                    
                                        
                                         | 
                                    
                                
                                
                        
                        
                            | 
                                Mar 2018
                             | 
                            
                                
                                    Columbia Emerging Markets Fund
                                
                             | 
                            
                                1,903,604
                             | 
                            
                            
                                2.10%
                             | 
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                        
                                         | 
                                    
                                    
                                        
                                         | 
                                    
                                
                                
                        
                        
                            | 
                                Dec 2017
                             | 
                            
                                
                                    Columbia Emerging Markets Fund
                                
                             | 
                            
                                1,940,376
                             | 
                            
                            
                                2.15%
                             | 
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                        
                                         | 
                                    
                                    
                                        
                                         | 
                                    
                                
                                
                        
                        
                            | 
                                Sep 2017
                             | 
                            
                                
                                    Columbia Variable Portfolio - Emerging Markets Fund
                                
                             | 
                            
                                1,076,913
                             | 
                            
                            
                                1.20%
                             | 
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                        
                    
                        
                        
                            | 
                                Sep 2017
                             | 
                            
                                
                                    Columbia Emerging Markets Fund
                                
                             | 
                            
                                1,940,376
                             | 
                            
                            
                                2.16%
                             | 
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                        
                                         | 
                                    
                                    
                                        
                                         | 
                                    
                                
                                
                        
                        
                            | 
                                Jun 2017
                             | 
                            
                                
                                    Columbia Variable Portfolio- Emerging Markets
                                
                             | 
                            
                                1,076,913
                             | 
                            
                            
                                1.20%
                             | 
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                            
                                
                                    700,370
                                 | 
                                
                                    65.03%
                                 | 
                            
                        
                    
                        
                        
                            | 
                                Jun 2017
                             | 
                            
                                
                                    Columbia Emerging Markets Fund
                                
                             | 
                            
                                1,940,376
                             | 
                            
                            
                                2.17%
                             | 
                            
                                
                                    0
                                 | 
                                
                                    0.00%
                                 | 
                            
                            
                                
                                    1,245,145
                                 | 
                                
                                    64.17%
                                 |