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Investments (AFS by Type) (Details) - Ameriprise Financial - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
[1]
Investments            
Amortized cost $ 33,858   $ 33,601      
Gross unrealized gains 2,331   2,727      
Gross unrealized losses (43)   (34)      
Allowance for Credit Loss 0 $ 0 (11) [1] $ (14) $ (13) $ 0
Fair value 36,146   36,283      
Accrued interest excluded from amortized cost basis 176   178      
Fair value of securities owned and pledged as collateral 2,900   3,600      
Fair value of securities owned and pledged as collateral which are eligible for rehypothecation $ 501   $ 454      
Fixed maturity securities as percentage of total investments 92.00%   88.00%      
Fixed Maturity Investments Rated Internally $ 682   $ 605      
Corporate debt securities            
Investments            
Amortized cost 12,038   11,762      
Gross unrealized gains 1,665   1,924      
Gross unrealized losses (27)   (2)      
Allowance for Credit Loss 0 0 (10) [1] (13) (13) 0
Fair value 13,676   13,674      
Residential mortgage backed securities            
Investments            
Amortized cost 9,556   9,845      
Gross unrealized gains 135   188      
Gross unrealized losses (9)   (4)      
Fair value 9,682   10,029      
Commercial mortgage backed securities            
Investments            
Amortized cost 5,995   5,867      
Gross unrealized gains 187   242      
Gross unrealized losses (4)   (21)      
Fair value 6,178   6,088      
Asset backed securities            
Investments            
Amortized cost 3,603   3,283      
Gross unrealized gains 46   52      
Gross unrealized losses (1)   (5)      
Allowance for Credit Loss 0 $ 0 (1) [1] $ (1) $ 0 $ 0
Fair value 3,648   3,329      
State and municipal obligations            
Investments            
Amortized cost 1,039   1,088      
Gross unrealized gains 281   297      
Gross unrealized losses (1)   (1)      
Fair value 1,319   1,384      
U.S. government and agencies obligations            
Investments            
Amortized cost 1,326   1,456      
Fair value 1,326   1,456      
Foreign government bonds and obligations            
Investments            
Amortized cost 207   241      
Gross unrealized gains 17   22      
Gross unrealized losses (1)   (1)      
Fair value 223   262      
Other securities [Member]            
Investments            
Amortized cost 94   59      
Gross unrealized gains     2      
Fair value $ 94   $ 61      
[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.