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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Footnotes) (Details 4) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Surplus Loan due 2050        
Investments [Abstract]        
Proceeds from Issuance of Debt $ 500      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.50% 3.50%    
Long-term debt $ 500 $ 500    
Ameriprise Financial, Inc:        
Investments [Abstract]        
Long-term debt 2,831 2,831 $ 3,097  
Residual tranche fair value 877 877 1,430  
Guarantees, Commitments and Contingencies        
Maximum borrowing capacity under the line of credit 366 366    
Loans to subsidiaries 247 247 361  
Current borrowing capacity under the line of credit 1,300 1,300 1,300  
Outstanding amount 172 172 50  
Ameriprise Financial, Inc: | Ameriprise Certificate Company [Member]        
Guarantees, Commitments and Contingencies        
Maximum commitment under Capital Support Agreement 50 50 50 $ 50
Ameriprise Financial, Inc: | Ameriprise Financial Services, Inc. [Member]        
Guarantees, Commitments and Contingencies        
Secured demand notes 200 200    
Ameriprise Financial, Inc: | Ameriprise Enterprise Investment Services Inc. [Member]        
Guarantees, Commitments and Contingencies        
Loans to subsidiaries 60 60    
Ameriprise Financial, Inc: | Asset-backed Securities, Securitized Loans and Receivables [Member]        
Investments [Abstract]        
Residual tranche fair value 90 90 94  
Ameriprise Financial, Inc: | Net investment income [Member]        
Investments [Abstract]        
Related Party Transaction, Amounts of Transaction   6    
Ameriprise Financial, Inc: | Federal Home Loan Bank advances [Member]        
Debt        
Short-term borrowings $ 200 $ 200 $ 201