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Investments (AFS by Type) (Details) - Ameriprise Financial [Member] - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Investments    
Amortized cost $ 29,112 $ 30,671
Gross unrealized gains 1,891 844
Gross unrealized losses (36) (457)
Fair value 30,967 31,058
Noncredit OTTI [1] 1 1
Fair value of securities owned and pledged as collateral 2,400 1,500
Fair value of securities owned and pledged as collateral which are eligible for rehypothecation $ 724 $ 510
Fixed maturity securities as percentage of total investments 87.00% 87.00%
Corporate debt securities [Member]    
Investments    
Amortized cost $ 11,203 $ 13,741
Gross unrealized gains 1,318 555
Gross unrealized losses (13) (230)
Fair value 12,508 14,066
Noncredit OTTI [1] 0  
Residential mortgage backed securities [Member]    
Investments    
Amortized cost 8,020 6,373
Gross unrealized gains 104 34
Gross unrealized losses (12) (78)
Fair value 8,112 6,329
Commercial mortgage backed securities [Member]    
Investments    
Amortized cost 5,144 4,975
Gross unrealized gains 134 18
Gross unrealized losses (3) (116)
Fair value 5,275 4,877
Asset backed securities [Member]    
Investments    
Amortized cost 1,631 1,373
Gross unrealized gains 51 36
Gross unrealized losses (2) (11)
Fair value 1,680 1,398
Noncredit OTTI [1] 1 1
State and municipal obligations [Member]    
Investments    
Amortized cost 1,166 2,166
Gross unrealized gains 265 192
Gross unrealized losses (3) (13)
Fair value 1,428 2,345
U.S. government and agencies obligations [Member]    
Investments    
Amortized cost 1,692 1,745
Gross unrealized gains 1 0
Gross unrealized losses 0 0
Fair value 1,693 1,745
Foreign government bonds and obligations [Member]    
Investments    
Amortized cost 256 298
Gross unrealized gains 18 9
Gross unrealized losses (3) (9)
Fair value $ 271 $ 298
[1]
Represents the amount of OTTI losses in AOCI. Amount includes unrealized gains and losses on impaired securities subsequent to the initial impairment measurement date. These amounts are included in gross unrealized gains and losses as of the end of the period.