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Shares And Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Unrealized Gain (Loss) on AFS Securities [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance as of beginning-of-year | $ 9,611 | $ 5,983
Income tax benefit (expense) | 888 | 720
Less: |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (2) | 2
Associated amortization of DAC, VOBA, DSI, and DFEL | (4) | 32
Income tax benefit (expense) |  | (6)
Balance as of end-of-period | 6,324 | 3,340
Unrealized Gain (Loss) on AFS Securities [Member] | Gains (Losses) Arising During The Year [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications and taxes | (7,420) | (4,498)
Unrealized Gain (Loss) on AFS Securities [Member] | Change in Foreign Currency Exchange Rate Adjustment [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications and taxes | (44) | (150)
Unrealized Gain (Loss) on AFS Securities [Member] | Change in Deferred Insurance Charges [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications and taxes | 3,287 | 1,264
Unrealized OTTI on AFS Securities [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance as of beginning-of-year |  | 45
Unrealized Gain (Loss) on Derivative Instruments [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance as of beginning-of-year | (402) | (11)
Change in DAC, VOBA, DSI and DFEL | 14 | (53)
Income tax benefit (expense) | (30) | (8)
Less: |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 3 | 9
Associated amortization of DAC, VOBA, DSI, and DFEL | (1) | (6)
Income tax benefit (expense) |  | (1)
Balance as of end-of-period | (284) | 8
Unrealized Gain (Loss) on Derivative Instruments [Member] | Gains (Losses) Arising During The Year [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications and taxes | 89 | (71)
Unrealized Gain (Loss) on Derivative Instruments [Member] | Change in Foreign Currency Exchange Rate Adjustment [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications and taxes | 47 | 153
Unrealized Gain (Loss) on Derivative Instruments [Member] | Change in Deferred Insurance Charges [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications and taxes | 14 | (53)
Foreign Currency Translation Adjustment [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance as of beginning-of-year | (12) | (17)
Other comprehensive income (loss) before reclassifications and taxes | 2 | (10)
Less: |  |
Balance as of end-of-period | (10) | (27)
Funded Status of Employee Benefit Plans [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance as of beginning-of-year | (266) | (327)
Other comprehensive income (loss) before reclassifications and taxes | (3) | 10
Less: |  |
Balance as of end-of-period | $ (269) | (317)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Unrealized Gain (Loss) on AFS Securities [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance as of beginning-of-year |  | 45
Cumulative Effect, Period of Adoption, Adjustment [Member] | Unrealized OTTI on AFS Securities [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance as of beginning-of-year |  | $ (45)

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