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Investments (AFS by Type) (Details 3) - Ameriprise Financial [Member] - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Investments    
Amortized cost $ 29,318 $ 29,472
Gross unrealized gains 1,607 1,472
Gross unrealized losses (99) (225)
Fair value 30,826 30,719
Noncredit OTTI [1] 11 8
Fair value of securities owned and pledged as collateral 1,700 1,600
Fair value of securities owned and pledged as collateral which are eligible for rehypothecation $ 793 $ 473
Fixed maturity securities as percentage of total investments 85.00% 86.00%
Fixed maturity investments rated internally $ 1,100 $ 1,100
Corporate debt securities [Member]    
Investments    
Amortized cost 14,528 15,231
Gross unrealized gains 1,145 1,065
Gross unrealized losses (23) (60)
Fair value 15,650 16,236
Residential mortgage backed securities [Member]    
Investments    
Amortized cost 6,740 6,899
Gross unrealized gains 79 86
Gross unrealized losses (29) (67)
Fair value 6,790 6,918
Noncredit OTTI [1]   (3)
Commercial mortgage backed securities [Member]    
Investments    
Amortized cost 3,917 3,347
Gross unrealized gains 62 59
Gross unrealized losses (27) (39)
Fair value 3,952 3,367
Asset backed securities [Member]    
Investments    
Amortized cost 1,611 1,532
Gross unrealized gains 39 33
Gross unrealized losses (4) (16)
Fair value 1,646 1,549
Noncredit OTTI [1] 5 5
State and municipal obligations [Member]    
Investments    
Amortized cost 2,216 2,195
Gross unrealized gains 249 198
Gross unrealized losses (10) (35)
Fair value 2,455 2,358
U.S. government and agencies obligations [Member]    
Investments    
Amortized cost 5 7
Gross unrealized gains 1 1
Fair value 6 8
Foreign government bonds and obligations [Member]    
Investments    
Amortized cost 292 251
Gross unrealized gains 21 17
Gross unrealized losses (5) (7)
Fair value 308 261
Common stocks [Member]    
Investments    
Amortized cost 9 10
Gross unrealized gains 11 13
Gross unrealized losses (1) (1)
Fair value 19 22
Noncredit OTTI [1] $ 6 $ 6
[1] Represents the amount of other-than-temporary impairment (“OTTI”) losses in accumulated other comprehensive income (“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.