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Shareholders' Equity Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net unrealized securities gains, before tax [Abstract] |  |  |  |  |
Net unrealized securities gains (losses) arising during the period before tax | [1] | $ 1,404 | $ (1,039) | $ 243 |
Reclassification of net securities (gains) losses included in net income before tax | [2] | 6 | (9) | (55) |
Impact of deferred acquisition costs, deferred sales inducement costs, unearned revenue, benefit reserves and reinsurance recoverables before tax |  | (688) | 435 | (180) |
Net unrealized securities gains before tax |  | 722 | (613) | 8 |
Net unrealized derivatives losses, before tax [Abstract] |  |  |  |  |
Reclassification of net derivative losses included in net income before tax | [3] | (3) |  | 5 |
Net unrealized derivatives losses before tax |  | (3) |  | 5 |
Defined benefit plans, before tax [Abstract] |  |  |  |  |
Prior service credit before tax |  | 14 |  | 2 |
Net loss arising during the period before tax |  | (36) | (30) | 38 |
Defined benefit plans before tax |  | (22) | (30) | 40 |
Foreign currency translation before tax |  | 18 | (32) | 74 |
Other comprehensive income attributable to Ameriprise Financial before tax |  |  |  | (1) |
Other Comprehensive Income (Loss), before Tax |  | 715 | (675) | 126 |
Net unrealized securities gains, tax impact [Abstract] |  |  |  |  |
Net unrealized securities (gains) losses arising during the period tax impact | [1] | (309) | 237 | (77) |
Reclassification of net securities gains (losses) included in net income tax impact | [2] | (1) | 2 | 19 |
Impact of deferred acquisition costs, deferred sales inducement costs, unearned revenue, benefit reserves and reinsurance recoverables tax impact |  | 144 | (91) | 57 |
Net unrealized securities gains tax impact |  | (166) | 148 | (1) |
Net unrealized derivatives losses, tax impact [Abstract] |  |  |  |  |
Reclassification of net derivative losses included in net income tax impact | [3] | 1 |  | (2) |
Net unrealized derivatives losses tax impact |  | 1 |  | (2) |
Defined benefit plans, net of tax [Abstract] |  |  |  |  |
Prior service credit tax impact |  | (3) |  | (1) |
Net loss arising during the period tax |  | 7 | 7 | (11) |
Defined benefit plans tax impact |  | 4 | 7 | (12) |
Foreign currency translation tax impact |  | (1) | 1 | (82) | [4]
Other comprehensive income attributable to Ameriprise Financial tax impact |  |  |  | 0 |
Other Comprehensive Income (Loss), Tax |  | (162) | 156 | (97) |
Net unrealized securities gains, net of tax [Abstract] |  |  |  |  |
Net unrealized securities gains (losses) arising during the period, net of tax | [1] | 1,095 | (802) | 166 |
Reclassification of net securities (gains) losses included in net income net of tax | [2] | 5 | (7) | (36) |
Impact of deferred acquisition costs, deferred sales inducement costs, unearned revenue, benefit reserves and reinsurance recoverables net of tax |  | (544) | 344 | (123) |
Net unrealized securities gains net of tax |  | 556 | (465) | 7 |
Net unrealized derivative losses, net of tax [Abstract] |  |  |  |  |
Reclassification of net derivative losses included in net income net of tax | [3] | (2) |  | 3 |
Net unrealized derivatives losses net of tax |  | (2) |  | 3 |
Defined benefit plans, net of tax [Abstract] |  |  |  |  |
Prior service credit net of tax |  | 11 |  | 1 |
Net loss arising during the period net of tax |  | (29) | (23) | 27 |
Defined benefit plans net of tax |  | (18) | (23) | 28 |
Foreign currency translation net of tax |  | 17 | (31) | (8) |
Other |  | 0 | 0 | (1) |
Total other comprehensive income (loss), net of tax |  | 553 | (519) | 29 |
Interest expense [Member] |  |  |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income into income |  | 2 | 2 | 2 |
Net investment income [Member] |  |  |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income into income |  | $ 0 | $ (2) | (5) |
Decrease to other comprehensive income related to deferred taxes on currency translation adjustments [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Quantifying Misstatement in Current Year Financial Statements, Amount |  |  |  | $ 87 |
[1] | Includes OTTI losses on Available-for-Sale securities related to factors other than credit that were recognized in other comprehensive income (loss) during the period.
[2] | Reclassification amounts are recorded in net investment income.
[3] | Includes a $2 million, $2 million and $2 million pretax gain reclassified to interest and debt expenses and nil, a $2 million and $5 million pretax loss reclassified to net investment income for the years ended December 31, 2019, 2018 and 2017, respectively.
[4] | Includes an $87 million decrease to OCI related to deferred taxes on currency translations adjustments.

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