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Accumulated Other Comprehensive Income Loss - AOCI Rollforward (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance | $ 13,494 |  |  | $ 13,494 |  |  |
OCI, net of tax |  | $ (166) | $ 91 | (2,177) | $ 922 |  |
Ending balance |  | 12,729 | 17,233 | 12,729 | 17,233 |  |
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] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
OCI, before Reclassifications, Net of Tax, Attributable to Parent |  | (183) | 119 | (2,213) | 683 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 1,931 | 211 | 1,755 | 1,931 | 1,276 |  |
Cumulative effect of accounting changes, net of tax [1] |  |  |  |  |  | $ 273 |
Adjusted balance, beginning of period |  |  |  |  |  | 2,204 |
Amounts reclassified from AOCI |  | 12 | (34) | 49 | (119) |  |
OCI, net of tax |  | (171) | 85 | (2,164) | 564 |  |
Ending balance |  | 40 | 1,840 | 40 | 1,840 |  |
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
OCI, before Reclassifications, Net of Tax, Attributable to Parent |  | (1) | (1) | 0 | (1) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance | (3) | (3) | (3) | (3) | (3) |  |
Cumulative effect of accounting changes, net of tax [1] |  |  |  |  |  | 0 |
Adjusted balance, beginning of period |  |  |  |  |  | (3) |
Amounts reclassified from AOCI |  | 0 | 0 | (1) | 0 |  |
OCI, net of tax |  | (1) | (1) | (1) | (1) |  |
Ending balance |  | (4) | (4) | (4) | (4) |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
OCI, before Reclassifications, Net of Tax, Attributable to Parent |  | 1 | (2) | (12) | 7 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 18 | (12) | 57 | 18 | 76 |  |
Cumulative effect of accounting changes, net of tax [1] |  |  |  |  |  | 2 |
Adjusted balance, beginning of period |  |  |  |  |  | 20 |
Amounts reclassified from AOCI |  | (6) | (12) | (25) | (40) |  |
OCI, net of tax |  | (5) | (14) | (37) | (33) |  |
Ending balance |  | (17) | 43 | (17) | 43 |  |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
OCI, before Reclassifications, Net of Tax, Attributable to Parent |  | 1 | 14 | (4) | 21 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 34 | 33 | 13 | 34 | 6 |  |
Cumulative effect of accounting changes, net of tax [1] |  |  |  |  |  | 4 |
Adjusted balance, beginning of period |  |  |  |  |  | 38 |
Amounts reclassified from AOCI |  | 0 | 0 | 0 | 0 |  |
OCI, net of tax |  | 1 | 14 | (4) | 21 |  |
Ending balance |  | 34 | 27 | 34 | 27 |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
OCI, before Reclassifications, Net of Tax, Attributable to Parent |  | 1 | 1 | 0 | (144) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance | (1,317) | (1,582) | (1,328) | (1,317) | (1,692) |  |
Cumulative effect of accounting changes, net of tax [1] |  |  |  |  |  | (284) |
Adjusted balance, beginning of period |  |  |  |  |  | (1,601) |
Amounts reclassified from AOCI |  | 9 | 6 | 29 | 515 |  |
OCI, net of tax |  | 10 | 7 | 29 | 371 |  |
Ending balance |  | (1,572) | (1,321) | (1,572) | (1,321) |  |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
OCI, before Reclassifications, Net of Tax, Attributable to Parent |  | (181) | 131 | (2,229) | 566 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance | $ 663 | (1,353) | 494 | 663 | (337) |  |
Cumulative effect of accounting changes, net of tax [1] |  |  |  |  |  | (5) | $ 0
Adjusted balance, beginning of period |  |  |  |  |  | $ 658 | $ (337)
Amounts reclassified from AOCI |  | 15 | (40) | 52 | 356 |  |
OCI, net of tax |  | (166) | 91 | (2,177) | 922 |  |
Ending balance |  | $ (1,519) | $ 585 | $ (1,519) | $ 585 |  |

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