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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