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Changes in and Reclassifications From Accumulated Other Comprehensive Income (Loss) - AOCI Rollforward (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018 | May 31, 2018 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect | $ (88) |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 13,494 | $ 13,101 | $ 13,494 |  |  |  |
OCI, net of tax |  | 1,631 | (2,237) | $ 1,000 |  |  |
Ending balance |  | 16,270 | 13,101 | 13,494 |  |  |
Net Unrealized Gain on Securities |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of accounting changes, net of tax |  |  |  | 273 |  |  |
Adjusted balance beginning of period |  |  |  | 2,204 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 1,931 | 24 | 1,931 | 1,276 |  |  |
OCI before reclassifications |  | 1,797 | (2,245) | 857 |  |  |
Amounts reclassified from AOCI |  | (137) | 65 | (202) |  |  |
OCI, net of tax |  | 1,660 | (2,180) | 655 |  |  |
Ending balance |  | 1,684 | 24 | 1,931 |  |  |
OTTI Losses in OCI |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of accounting changes, net of tax |  |  |  | 0 |  |  |
Adjusted balance beginning of period |  |  |  | (3) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance | (3) | (4) | (3) | (3) |  |  |
OCI before reclassifications |  | 1 | 0 | 0 |  |  |
Amounts reclassified from AOCI |  | 0 | (1) | 0 |  |  |
OCI, net of tax |  | 1 | (1) | 0 |  |  |
Ending balance |  | (3) | (4) | (3) |  |  |
Net Gain (Loss) on Cash Flow Hedging Instruments |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of accounting changes, net of tax |  |  |  | 2 |  |  |
Adjusted balance beginning of period |  |  |  | 20 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 18 | (5) | 18 | 76 |  |  |
OCI before reclassifications |  | 22 | 8 | (8) |  |  |
Amounts reclassified from AOCI |  | (8) | (33) | (50) |  |  |
OCI, net of tax |  | 14 | (25) | (58) |  |  |
Ending balance |  | 9 | (5) | 18 |  |  |
Foreign Currency Translation Adjustments |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of accounting changes, net of tax |  |  |  | 4 |  |  |
Adjusted balance beginning of period |  |  |  | 38 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 34 | 30 | 34 | 6 |  |  |
OCI before reclassifications |  | 4 | (8) | 28 |  |  |
Amounts reclassified from AOCI |  | 0 | 0 | 0 |  |  |
OCI, net of tax |  | 4 | (8) | 28 |  |  |
Ending balance |  | 34 | 30 | 34 |  |  |
Pension and Other Postretirement Plan Adjustments |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of accounting changes, net of tax |  |  |  | (284) |  |  |
Adjusted balance beginning of period |  |  |  | (1,601) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance | (1,317) | (1,624) | (1,317) | (1,692) |  |  |
OCI before reclassifications |  | (82) | (61) | (146) |  |  |
Amounts reclassified from AOCI |  | 34 | 38 | 521 |  |  |
OCI, net of tax |  | (48) | (23) | 375 |  |  |
Ending balance |  | (1,672) | (1,624) | (1,317) |  |  |
AOCI, net of tax |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of accounting changes, net of tax |  | 0 |  | (5) |  |  | $ 0
Adjusted balance beginning of period |  |  | (1,579) | 658 |  |  | $ (337)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 663 | (1,579) | 663 | (337) |  |  |
OCI before reclassifications |  | 1,742 | (2,306) | 731 |  |  |
Amounts reclassified from AOCI |  | (111) | 69 | 269 |  |  |
OCI, net of tax |  | 1,631 | (2,237) | 1,000 |  |  |
Ending balance |  | $ 52 | $ (1,579) | 663 |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operations, Adjustments to AOCI |  |  |  | $ 1,000 | $ 758 | $ 758 |
Equity securities and shadow DAC [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of accounting changes, net of tax | $ 93 |  |  |  |  |  |

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