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Debt (Narrative) (Details 2) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 28, 2019
Debt and stated interest rates            
Repayments of Long-term Debt     $ 313 $ 13 $ 11  
Ameriprise Financial [Member] | Repurchase agreements [Member]            
Debt and stated interest rates            
Remaining maturity of outstanding amount for short term borrowings       3 months    
Ameriprise Financial [Member] | Repurchase agreements [Member] | Residential mortgage backed securities [Member]            
Debt and stated interest rates            
Securities pledged as collateral       $ 52    
Ameriprise Financial [Member] | Federal Home Loan Bank advances [Member]            
Debt and stated interest rates            
Remaining maturity of outstanding amount for short term borrowings     2 months 3 months    
Ameriprise Financial [Member] | Federal Home Loan Bank advances [Member] | Residential mortgage backed securities [Member]            
Debt and stated interest rates            
Securities pledged as collateral     $ 184 $ 0    
Ameriprise Financial [Member] | Federal Home Loan Bank advances [Member] | Commercial mortgage backed securities [Member]            
Debt and stated interest rates            
Securities pledged as collateral     $ 905 $ 780    
Ameriprise Financial [Member] | Senior notes due 2022 [Member]            
Debt and stated interest rates            
Unsecured senior notes issued   $ 500        
Debt issuance costs   $ 3        
Stated interest rate (as a percent) long-term debt     3.00%      
Ameriprise Financial [Member] | Senior notes due 2019 [Member]            
Debt and stated interest rates            
Repayments of Long-term Debt $ 300          
Stated interest rate (as a percent) long-term debt       7.30%   7.30%