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Shares And Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 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) | 640 | (652)
Less: |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (4) | (48)
Associated amortization of DAC, VOBA, DSI, and DFEL | (18) | 42
Income tax benefit (expense) | 5 | 1
Balance as of end-of-period | 7,260 | 8,425
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 | (4,244) | 5,426
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 | (123) | 21
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 | 1,359 | (2,403)
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 |  | (64)
Income tax benefit (expense) | (76) | 62
Less: |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 16 | 38
Associated amortization of DAC, VOBA, DSI, and DFEL | (1) | (8)
Income tax benefit (expense) | (3) | (6)
Balance as of end-of-period | (132) | (272)
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 | 229 | (219)
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 | 129 | (16)
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 |  | (64)
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) | (4)
Less: |  |
Balance as of end-of-period | (14) | (21)
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 | 1 | 4
Less: |  |
Balance as of end-of-period | $ (265) | (323)
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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