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Accumulated Other Comprehensive Income Loss - AOCI Rollforward (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 13,101 |  |  |  |  |
OCI, net of tax |  | $ 687 | $ (1,114) | 1,381 | $ (2,011) |  |  |  |
Ending balance |  | 15,292 | 12,546 | 15,292 | 12,546 |  |  |  |
TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect | $ (88) |  |  |  |  |  |  |  |
Equity securities and shadow DAC [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Cumulative effect of accounting changes, net of tax [1] | 93 |  |  |  |  |  |  |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | 1,931 | 703 | 1,349 | 24 | 1,931 |  |  |  |
Cumulative effect of accounting changes, net of tax [1] |  |  |  |  |  |  |  |  | $ 273
Adjusted balance, beginning of period |  |  |  |  |  |  |  |  | 2,204
OCI before reclassifications |  | 703 | (1,148) | 1,399 | (2,030) |  |  |  |
Amounts reclassified from AOCI |  | (39) | 10 | (56) | 37 |  |  |  |
OCI, net of tax |  | 664 | (1,138) | 1,343 | (1,993) |  |  |  |
Ending balance |  | 1,367 | 211 | 1,367 | 211 |  |  |  |
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | (3) | (3) | (5) | (4) | (3) |  |  |  |
Cumulative effect of accounting changes, net of tax [1] |  |  |  |  |  |  |  |  | 0
Adjusted balance, beginning of period |  |  |  |  |  |  |  |  | (3)
OCI before reclassifications |  | 0 | 3 | 1 | 1 |  |  |  |
Amounts reclassified from AOCI |  | 0 | (1) | 0 | (1) |  |  |  |
OCI, net of tax |  | 0 | 2 | 1 | 0 |  |  |  |
Ending balance |  | (3) | (3) | (3) | (3) |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | 18 | 0 | (24) | (5) | 18 |  |  |  |
Cumulative effect of accounting changes, net of tax [1] |  |  |  |  |  |  |  |  | 2
Adjusted balance, beginning of period |  |  |  |  |  |  |  |  | 20
OCI before reclassifications |  | 13 | 18 | 19 | (13) |  |  |  |
Amounts reclassified from AOCI |  | (2) | (6) | (3) | (19) |  |  |  |
OCI, net of tax |  | 11 | 12 | 16 | (32) |  |  |  |
Ending balance |  | 11 | (12) | 11 | (12) |  |  |  |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | 34 | 31 | 32 | 30 | 34 |  |  |  |
Cumulative effect of accounting changes, net of tax [1] |  |  |  |  |  |  |  |  | 4
Adjusted balance, beginning of period |  |  |  |  |  |  |  |  | 38
OCI before reclassifications |  | 3 | 1 | 4 | (5) |  |  |  |
Amounts reclassified from AOCI |  | 0 | 0 | 0 | 0 |  |  |  |
OCI, net of tax |  | 3 | 1 | 4 | (5) |  |  |  |
Ending balance |  | 34 | 33 | 34 | 33 |  |  |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | (1,317) | (1,616) | (1,591) | (1,624) | (1,317) |  |  |  |
Cumulative effect of accounting changes, net of tax [1] |  |  |  |  |  |  |  |  | (284)
Adjusted balance, beginning of period |  |  |  |  |  |  |  |  | (1,601)
OCI before reclassifications |  | 0 | (1) | 0 | (1) |  |  |  |
Amounts reclassified from AOCI |  | 9 | 10 | 17 | 20 |  |  |  |
OCI, net of tax |  | 9 | 9 | 17 | 19 |  |  |  |
Ending balance |  | (1,607) | (1,582) | (1,607) | (1,582) |  |  |  |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | $ 663 | (885) | (239) | (1,579) | 663 |  |  |  |
Cumulative effect of accounting changes, net of tax [1] |  |  |  |  |  | $ 0 | $ 0 | $ 0 | (5)
Adjusted balance, beginning of period |  |  |  |  |  | $ (885) | $ (1,579) | $ (239) | $ 658
OCI before reclassifications |  | 719 | (1,127) | 1,423 | (2,048) |  |  |  |
Amounts reclassified from AOCI |  | (32) | 13 | (42) | 37 |  |  |  |
OCI, net of tax |  | 687 | (1,114) | 1,381 | (2,011) |  |  |  |
Ending balance |  | $ (198) | (1,353) | $ (198) | (1,353) |  |  |  |
Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operations, Adjustments to AOCI |  |  | $ 758 |  | $ 758 |  |  |  |

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