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Investments (AFS by Type) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Investments |  |  |  |
Allowance for credit loss | $ (30) | $ (2) |  |
Corporate debt securities [Member] |  |  |  |
Investments |  |  |  |
Allowance for credit loss | 13 | 13 | $ 0 | [1]
Asset backed securities [Member] |  |  |  |
Investments |  |  |  |
Allowance for credit loss | 1 | $ 1 | 0 | [1]
Ameriprise Financial [Member] |  |  |  |
Investments |  |  |  |
Amortized cost | 33,614 |  | 31,332 |
Gross unrealized gains | 2,454 |  | 1,834 |
Gross unrealized losses | (95) |  | (37) |
Allowance for credit loss | (14) |  |  |
Fair value | 35,959 |  | 33,129 |
Accrued interest excluded from amortized cost basis | 190 |  | 177 |
Fair value of securities owned and pledged as collateral | 3,800 |  | 2,200 |
Fair value of securities owned and pledged as collateral which are eligible for rehypothecation | $ 483 |  | $ 576 |
Fixed maturity securities as percentage of total investments | 88.00% |  | 87.00% |
Fixed Maturity Investments Rated Internally | $ 706 |  | $ 624 |
Ameriprise Financial [Member] | Corporate debt securities [Member] |  |  |  |
Investments |  |  |  |
Amortized cost | 11,402 |  | 10,847 |
Gross unrealized gains | 1,667 |  | 1,344 |
Gross unrealized losses | (34) |  | (4) |
Allowance for credit loss | (13) |  |  |
Fair value | 13,022 |  | 12,187 |
Ameriprise Financial [Member] | Residential mortgage backed securities [Member] |  |  |  |
Investments |  |  |  |
Amortized cost | 10,071 |  | 9,954 |
Gross unrealized gains | 194 |  | 94 |
Gross unrealized losses | (7) |  | (19) |
Fair value | 10,258 |  | 10,029 |
Ameriprise Financial [Member] | Commercial mortgage backed securities [Member] |  |  |  |
Investments |  |  |  |
Amortized cost | 6,016 |  | 5,473 |
Gross unrealized gains | 235 |  | 96 |
Gross unrealized losses | (39) |  | (6) |
Fair value | 6,212 |  | 5,563 |
Ameriprise Financial [Member] | Asset backed securities [Member] |  |  |  |
Investments |  |  |  |
Amortized cost | 3,053 |  | 1,968 |
Gross unrealized gains | 48 |  | 42 |
Gross unrealized losses | (12) |  | (4) |
Allowance for credit loss | (1) |  |  |
Fair value | 3,088 |  | 2,006 |
Ameriprise Financial [Member] | State and municipal obligations [Member] |  |  |  |
Investments |  |  |  |
Amortized cost | 1,091 |  | 1,131 |
Gross unrealized gains | 290 |  | 238 |
Gross unrealized losses | (1) |  | (2) |
Fair value | 1,380 |  | 1,367 |
Ameriprise Financial [Member] | U.S. government and agencies obligations [Member] |  |  |  |
Investments |  |  |  |
Amortized cost | 1,680 |  | 1,679 |
Gross unrealized gains | 0 |  | 1 |
Gross unrealized losses |  |  | 0 |
Fair value | 1,680 |  | 1,680 |
Ameriprise Financial [Member] | Foreign government bonds and obligations [Member] |  |  |  |
Investments |  |  |  |
Amortized cost | 250 |  | 254 |
Gross unrealized gains | 19 |  | 19 |
Gross unrealized losses | (2) |  | (2) |
Fair value | 267 |  | 271 |
Ameriprise Financial [Member] | Other securities [Member] |  |  |  |
Investments |  |  |  |
Amortized cost | 51 |  | 26 |
Gross unrealized gains | 1 |  |  |
Fair value | $ 52 |  | $ 26 |
[1] | Prior to January 1, 2020, credit losses on Available-for-Sale securities were not recorded in an allowance but were recorded as a reduction of the book value of the security if the security was other-than-temporarily impaired. There is no adoption impact due to the prospective transition for Available-for-Sale securities.

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