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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.

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