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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Level 3 rollforwards-Assets) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Corporate debt securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  | $ 750 | $ 913 | $ 1,139
Total gains (losses) included in net income |  | (1) | (1) | (1)
Total gains (losses) included in other comprehensive income (loss) |  | 15 | 31 | (26)
Purchases |  | 62 | 55 | 15
Settlements |  | (54) | (248) | (214)
Balance, at the end of the period |  | 772 | 750 | 913
Changes in unrealized gains (losses) included in income relating to assets held at end of period |  | (1) | (1) | (1)
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period |  | 16 |  |
Residential mortgage backed securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  | 17 | 136 | 155
Total gains (losses) included in other comprehensive income (loss) |  | 1 |  | 1
Purchases |  | 220 | 477 | 70
Settlements |  |  | (12) | (29)
Transfers out of Level 3 |  | (229) | (584) | (61)
Balance, at the end of the period |  | 9 | 17 | 136
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period |  | 1 |  |
Commercial mortgage backed securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  | 0 | 20 | 0
Purchases |  |  |  | 72
Transfers out of Level 3 |  |  | (20) | (52)
Balance, at the end of the period |  |  | 0 | 20
Asset backed securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  | 19 | 6 | 7
Total gains (losses) included in other comprehensive income (loss) |  | (1) | (1) | 1
Purchases |  |  | 18 | 32
Settlements |  |  |  | (1)
Transfers into Level 3 |  | 14 | 14 | 2
Transfers out of Level 3 |  |  | (18) | (35)
Balance, at the end of the period |  | 32 | 19 | 6
Changes in unrealized gains (losses) included in income relating to assets held at end of period |  | (1) |  |
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period |  | (1) |  |
Total available-for-sale securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  | 786 | 1,075 | 1,301
Total gains (losses) included in net income | [1] | (1) | (1) | (1)
Total gains (losses) included in other comprehensive income (loss) |  | 15 | 30 | (24)
Purchases |  | 282 | 550 | 189
Settlements |  | (54) | (260) | (244)
Transfers into Level 3 |  | 14 | 14 | 2
Transfers out of Level 3 |  | (229) | (622) | (148)
Balance, at the end of the period |  | 813 | 786 | 1,075
Changes in unrealized gains (losses) included in income relating to assets held at end of period | [1] | (2) | (1) | (1)
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period |  | $ 16 |  |
Other derivative contracts [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | $ 0 | 0
Total gains (losses) included in net income | [2] |  |  | (3)
Purchases |  |  |  | 3
Balance, at the end of the period |  |  |  | $ 0
[1] | Included in net investment income in the Consolidated Statements of Operations.
[2] | Included in benefits, claims, losses and settlement expenses in the Consolidated Statements of Operations.

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- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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