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Income Tax (Tax Effects of Temporary Differences that Give Rise to Significant Portions of the Deferred Income Tax Asset and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Deferred Tax Assets, Net [Abstract] |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals | $ 92 | $ 95
Deferred Tax Assets, Operating Loss Carryforwards | 254 | 330
Deferred Tax Assets, Tax Credit Carryforwards | 0 | 38
Deferred Tax Assets, Gross | 346 | 463
Deferred Tax Assets, Valuation Allowance | (251) | (236)
Deferred Tax Assets, Net | 95 | 227
Deferred Tax Liabilities [Abstract] |  |
Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost | 775 | 675
Deferred Tax Liabilities Reinsurance Transactions | 1,105 | 1,208
Deferred Tax Liabilities, Investments | 1,043 | 645
Deferred Tax Liabilities, Undistributed Foreign Earnings | 354 | 308
Deferred Tax Liabilities, Unrealized Currency Transaction Gains | 40 | 52
Deferred Tax Liabilities, Prepaid Expenses | 20 | 26
Total Deferred Income Tax Liabilities | 3,339 | 2,915
Deferred Tax Liabilities, Net | 3,244 | 2,688
Balance Sheet Presentation Of Deferred Tax Liabilities [Abstract] |  |
Deferred Tax Assets, Other | 19 | 24
Deferred income taxes | 3,263 | 2,712
Deferred Tax Liabilities, Net | 3,244 | 2,688
Deferred Tax Liabilities, Other | $ 2 | $ 1

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