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Debt (Narrative) (Details 2) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 02, 2020
Debt and stated interest rates            
Repayments of Long-term Debt     $ 762 $ 313 $ 13  
Ameriprise Financial [Member] | Federal Home Loan Bank advances [Member]            
Debt and stated interest rates            
Remaining maturity of outstanding amount for short term borrowings     3 months 2 months    
Ameriprise Financial [Member] | Senior notes due 2025 [Member]            
Debt and stated interest rates            
Proceeds from Issuance of Debt $ 500          
Debt issuance costs $ 4          
Stated interest rate (as a percent) long-term debt     3.00%     3.00%
Ameriprise Financial [Member] | Senior notes due 2020 [Member]            
Debt and stated interest rates            
Repayments of Long-term Debt   $ 750        
Stated interest rate (as a percent) long-term debt       5.30%    
Ameriprise Financial [Member] | Senior notes due 2022 [Member]            
Debt and stated interest rates            
Stated interest rate (as a percent) long-term debt     3.00% 3.00%