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Investments (AFS by Type) (Details 3) - Ameriprise Financial [Member] - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Investments    
Amortized cost $ 30,343 $ 29,492
Gross unrealized gains 924 1,561
Gross unrealized losses (427) (126)
Fair value 30,840 30,927
Noncredit OTTI [1] 2 1
Fair value of securities owned and pledged as collateral 1,900 1,700
Fair value of securities owned and pledged as collateral which are eligible for rehypothecation $ 1,000 $ 803
Fixed maturity securities as percentage of total investments 87.00% 86.00%
Corporate debt securities [Member]    
Investments    
Amortized cost $ 13,880 $ 13,976
Gross unrealized gains 658 1,131
Gross unrealized losses (147) (32)
Fair value 14,391 15,075
Residential mortgage backed securities [Member]    
Investments    
Amortized cost 6,310 6,585
Gross unrealized gains 27 63
Gross unrealized losses (112) (37)
Fair value 6,225 6,611
Noncredit OTTI [1]   0
Commercial mortgage backed securities [Member]    
Investments    
Amortized cost 4,713 4,362
Gross unrealized gains 16 48
Gross unrealized losses (134) (36)
Fair value 4,595 4,374
Asset backed securities [Member]    
Investments    
Amortized cost 1,459 1,549
Gross unrealized gains 30 36
Gross unrealized losses (12) (5)
Fair value 1,477 1,580
Noncredit OTTI [1] 2 1
State and municipal obligations [Member]    
Investments    
Amortized cost 2,190 2,215
Gross unrealized gains 183 259
Gross unrealized losses (14) (11)
Fair value 2,359 2,463
U.S. government and agencies obligations [Member]    
Investments    
Amortized cost 1,495 502
Gross unrealized gains 0 1
Gross unrealized losses 0 0
Fair value 1,495 503
Foreign government bonds and obligations [Member]    
Investments    
Amortized cost 296 298
Gross unrealized gains 10 20
Gross unrealized losses (8) (4)
Fair value $ 298 314
Common stocks [Member]    
Investments    
Amortized cost   5
Gross unrealized gains   3
Gross unrealized losses   (1)
Fair value   7
Noncredit OTTI [1]   $ 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.