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Fair Values of Assets and Liabilities (Level 3 rollforwards-Assets) (Details 2) - Ameriprise Financial [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Corporate debt securities [Member] |  |  |  |  |
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward] |  |  |  |  |
Balance, at the beginning of the period |  | $ 744 | $ 809 | $ 750 | $ 913
Total gains (losses) included in net income |  |  | (1) | (1) | (1)
Total gains (losses) included in other comprehensive income (loss) |  | 5 | 4 | 13 | 32
Purchases |  | 7 | 21 | 12 | 35
Settlements |  | (14) | (39) | (32) | (185)
Balance, at the end of the period |  | 742 | 794 | 742 | 794
Changes in unrealized gains (losses) relating to assets held at end of period |  |  |  | (1) | (1)
Changes in unrealized gains (losses) OCI relating to assets held at end of period |  | 5 |  | 13 |
Residential mortgage backed securities [Member] |  |  |  |  |
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward] |  |  |  |  |
Balance, at the beginning of the period |  | 205 | 448 | 17 | 136
Total gains (losses) included in other comprehensive income (loss) |  |  |  | 1 |
Purchases |  | 33 | 60 | 220 | 477
Settlements |  |  | (6) |  | (12)
Transfers out of Level 3 |  | (188) | (348) | (188) | (447)
Balance, at the end of the period |  | 50 | 154 | 50 | 154
Changes in unrealized gains (losses) OCI relating to assets held at end of period |  |  |  | 1 |
Commercial mortgage backed securities [Member] |  |  |  |  |
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward] |  |  |  |  |
Balance, at the beginning of the period |  |  |  |  | 20
Transfers out of Level 3 |  |  |  |  | (20)
Balance, at the end of the period |  |  | 0 |  | 0
Asset backed securities [Member] |  |  |  |  |
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward] |  |  |  |  |
Balance, at the beginning of the period |  | 15 | 24 | 19 | 6
Total gains (losses) included in net income |  |  |  | (1) |
Total gains (losses) included in other comprehensive income (loss) |  | 1 |  | (1) |
Purchases |  |  |  |  | 18
Settlements |  | 1 |  |  |
Transfers into Level 3 |  | 13 | 14 | 13 | 14
Transfers out of Level 3 |  |  | (18) |  | (18)
Balance, at the end of the period |  | 30 | 20 | 30 | 20
Changes in unrealized gains (losses) relating to assets held at end of period |  |  |  | (1) |
Changes in unrealized gains (losses) OCI relating to assets held at end of period |  | 1 |  | (1) |
Available-for-sale securities [Member] |  |  |  |  |
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward] |  |  |  |  |
Balance, at the beginning of the period |  | 964 | 1,281 | 786 | 1,075
Total gains (losses) included in net income | [1] |  | (1) | (2) | (1)
Total gains (losses) included in other comprehensive income (loss) |  | 6 | 4 | 13 | 32
Purchases |  | 40 | 81 | 232 | 530
Settlements |  | (13) | (45) | (32) | (197)
Transfers into Level 3 |  | 13 | 14 | 13 | 14
Transfers out of Level 3 |  | (188) | (366) | (188) | (485)
Balance, at the end of the period |  | 822 | $ 968 | 822 | 968
Changes in unrealized gains (losses) relating to assets held at end of period | [1] |  |  | (2) | $ (1)
Changes in unrealized gains (losses) OCI relating to assets held at end of period |  | $ 6 |  | $ 13 |
[1] | Included in net investment income in the Consolidated Statements of Operations.

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