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Business Dispositions and Discontinued Operations - Reconciliation of the Major Line Items Constituting Pretax Profit (Loss) of Discontinued Operations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Benefits, losses and expenses |  |  |
Income (loss) from discontinued operations, net of tax | $ 0 | $ 0 | $ 322
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Life and Annuity Run-Off Business |  |  |
Revenues |  |  |
Earned premiums |  |  | 39
Fee income and other |  |  | 382
Net investment income |  |  | 519
Net realized capital losses |  |  | (68)
Total revenues |  |  | 872
Benefits, losses and expenses |  |  |
Benefits, losses and loss adjustment expenses |  |  | 535
Amortization of DAC |  |  | 58
Insurance operating costs and other expenses |  |  | 157
Total benefits, losses and expenses |  |  | 750
Income before income taxes |  |  | 122
Income tax expense |  |  | 2
Income from operations of discontinued operations, net of tax |  |  | 120
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  | 202
Income (loss) from discontinued operations, net of tax |  |  | $ 322

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