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Investments (AFS by Type) (Details 3) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Investments    
Fair value of investment securities pledged as collateral $ 1,500 $ 1,700
Fair value of investment securities pledged as collateral that may be repledged by the counterparty $ 510 $ 803
Fixed maturity securities as percentage of total investments 87.00% 86.00%
Ameriprise Financial [Member]    
Investments    
Amortized cost $ 30,671 $ 29,492
Gross unrealized gains 844 1,561
Gross unrealized losses (457) (126)
Fair value 31,058 30,927
Noncredit OTTI [1] 1 1
Ameriprise Financial [Member] | Corporate Debt Securities [Member]    
Investments    
Amortized cost 13,741 13,976
Gross unrealized gains 555 1,131
Gross unrealized losses (230) (32)
Fair value 14,066 15,075
Noncredit OTTI [1]   0
Ameriprise Financial [Member] | Residential mortgage backed securities [Member]    
Investments    
Amortized cost 6,373 6,585
Gross unrealized gains 34 63
Gross unrealized losses (78) (37)
Fair value 6,329 6,611
Noncredit OTTI [1] 0 0
Ameriprise Financial [Member] | Commercial mortgage backed securities [Member]    
Investments    
Amortized cost 4,975 4,362
Gross unrealized gains 18 48
Gross unrealized losses (116) (36)
Fair value 4,877 4,374
Ameriprise Financial [Member] | Asset backed securities [Member]    
Investments    
Amortized cost 1,373 1,549
Gross unrealized gains 36 36
Gross unrealized losses (11) (5)
Fair value 1,398 1,580
Noncredit OTTI [1] 1 1
Ameriprise Financial [Member] | State and municipal obligations [Member]    
Investments    
Amortized cost 2,166 2,215
Gross unrealized gains 192 259
Gross unrealized losses (13) (11)
Fair value 2,345 2,463
Ameriprise Financial [Member] | U.S. government and agencies obligations [Member]    
Investments    
Amortized cost 1,745 502
Gross unrealized gains 0 1
Fair value 1,745 503
Ameriprise Financial [Member] | Foreign government bonds and obligations [Member]    
Investments    
Amortized cost 298 298
Gross unrealized gains 9 20
Gross unrealized losses (9) (4)
Fair value $ 298 314
Ameriprise Financial [Member] | Common stocks [Member]    
Investments    
Amortized cost   5
Gross unrealized gains   3
Gross unrealized losses   (1)
Fair value   7
Noncredit OTTI   $ 0
[1] Represents the amount of other-than-temporary impairment (“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.