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Investments (AFS by Type) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Investments      
Allowance for credit loss $ (30) $ (2)  
Corporate debt securities [Member]      
Investments      
Allowance for credit loss 13 13 $ 0 [1]
Asset backed securities [Member]      
Investments      
Allowance for credit loss 1 $ 1 0 [1]
Ameriprise Financial [Member]      
Investments      
Amortized cost 33,614   31,332
Gross unrealized gains 2,454   1,834
Gross unrealized losses (95)   (37)
Allowance for credit loss (14)    
Fair value 35,959   33,129
Accrued interest excluded from amortized cost basis 190   177
Fair value of securities owned and pledged as collateral 3,800   2,200
Fair value of securities owned and pledged as collateral which are eligible for rehypothecation $ 483   $ 576
Fixed maturity securities as percentage of total investments 88.00%   87.00%
Fixed Maturity Investments Rated Internally $ 706   $ 624
Ameriprise Financial [Member] | Corporate debt securities [Member]      
Investments      
Amortized cost 11,402   10,847
Gross unrealized gains 1,667   1,344
Gross unrealized losses (34)   (4)
Allowance for credit loss (13)    
Fair value 13,022   12,187
Ameriprise Financial [Member] | Residential mortgage backed securities [Member]      
Investments      
Amortized cost 10,071   9,954
Gross unrealized gains 194   94
Gross unrealized losses (7)   (19)
Fair value 10,258   10,029
Ameriprise Financial [Member] | Commercial mortgage backed securities [Member]      
Investments      
Amortized cost 6,016   5,473
Gross unrealized gains 235   96
Gross unrealized losses (39)   (6)
Fair value 6,212   5,563
Ameriprise Financial [Member] | Asset backed securities [Member]      
Investments      
Amortized cost 3,053   1,968
Gross unrealized gains 48   42
Gross unrealized losses (12)   (4)
Allowance for credit loss (1)    
Fair value 3,088   2,006
Ameriprise Financial [Member] | State and municipal obligations [Member]      
Investments      
Amortized cost 1,091   1,131
Gross unrealized gains 290   238
Gross unrealized losses (1)   (2)
Fair value 1,380   1,367
Ameriprise Financial [Member] | U.S. government and agencies obligations [Member]      
Investments      
Amortized cost 1,680   1,679
Gross unrealized gains 0   1
Gross unrealized losses     0
Fair value 1,680   1,680
Ameriprise Financial [Member] | Foreign government bonds and obligations [Member]      
Investments      
Amortized cost 250   254
Gross unrealized gains 19   19
Gross unrealized losses (2)   (2)
Fair value 267   271
Ameriprise Financial [Member] | Other securities [Member]      
Investments      
Amortized cost 51   26
Gross unrealized gains 1    
Fair value $ 52   $ 26
[1] Prior to January 1, 2020, credit losses on Available-for-Sale securities were not recorded in an allowance but were recorded as a reduction of the book value of the security if the security was other-than-temporarily impaired. There is no adoption impact due to the prospective transition for Available-for-Sale securities.