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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, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | $ 13,494 |  | $ 13,494 |  | $ 13,494 |  |  |
OCI, net of tax |  | $ (1,114) |  | $ 701 | (2,011) | $ 831 |  |
Ending balance |  | 12,546 |  | 17,288 | 12,546 | 17,288 |  |
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 |  | (1,148) |  | 404 | (2,030) | 564 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 1,931 | 1,349 | 1,931 | 1,413 | 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 |  | 10 |  | (62) | 37 | (85) |  |
OCI, net of tax |  | (1,138) |  | 342 | (1,993) | 479 |  |
Ending balance |  | 211 | 1,349 | 1,755 | 211 | 1,755 |  |
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 |  | 3 |  | 1 | 1 | 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | (3) | (5) | (3) | (4) | (3) | (3) |  |
Cumulative effect of accounting changes, net of tax [1] |  |  |  |  |  |  | 0 |
Adjusted balance, beginning of period |  |  |  |  |  |  | (3) |
Amounts reclassified from AOCI |  | (1) |  | 0 | (1) | 0 |  |
OCI, net of tax |  | 2 |  | 1 | 0 | 0 |  |
Ending balance |  | (3) | (5) | (3) | (3) | (3) |  |
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 |  | 18 |  | 13 | (13) | 8 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 18 | (24) | 18 | 58 | 18 | 76 |  |
Cumulative effect of accounting changes, net of tax [1] |  |  |  |  |  |  | 2 |
Adjusted balance, beginning of period |  |  |  |  |  |  | 20 |
Amounts reclassified from AOCI |  | (6) |  | (14) | (19) | (27) |  |
OCI, net of tax |  | 12 |  | (1) | (32) | (19) |  |
Ending balance |  | (12) | (24) | 57 | (12) | 57 |  |
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 |  | 5 | (5) | 7 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 34 | 32 | 34 | 8 | 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 |  | 5 | (5) | 7 |  |
Ending balance |  | 33 | 32 | 13 | 33 | 13 |  |
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) |  | (141) | (1) | (140) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | (1,317) | (1,591) | (1,317) | (1,682) | (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 |  | 10 |  | 495 | 20 | 504 |  |
OCI, net of tax |  | 9 |  | 354 | 19 | 364 |  |
Ending balance |  | (1,582) | (1,591) | (1,328) | (1,582) | (1,328) |  |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
OCI, before Reclassifications, Net of Tax, Attributable to Parent |  | (1,127) |  | 282 | (2,048) | 439 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | $ 663 | (239) | 663 | (207) | 663 | (337) |  |
Cumulative effect of accounting changes, net of tax [1] |  |  |  |  |  |  | (5) | $ 0
Adjusted balance, beginning of period |  |  |  |  |  |  | $ 658 | $ (337)
Amounts reclassified from AOCI |  | 13 |  | 419 | 37 | 392 |  |
OCI, net of tax |  | (1,114) |  | 701 | (2,011) | 831 |  |
Ending balance |  | (1,353) | $ (239) | $ 494 | (1,353) | $ 494 |  |
Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operations, Adjustments to AOCI |  | $ 758 |  |  | $ 758 |  |  |

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