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Shares And Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance as of beginning-of-year | $ 5,673 |
Less: |  |
Balance as of end-of-period | 7,809 |
Unrealized Gain (Loss) on AFS Securities [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance as of beginning-of-year | 5,983 | $ 557
Unrealized holding gains (losses) arising during the period | 5,426 | 9,849
Change in foreign currency exchange rate adjustment | 21 | (80)
Change in DAC, VOBA, DSI, future contract benefits and other contract holder funds | (2,403) | (2,271)
Income tax benefit (expense) | (652) | (1,596)
Less: |  |
Reclassification adjustment for gains (losses) included in net income (loss) | (48) | (18)
Associated amortization of DAC, VOBA, DSI, and DFEL | 42 | (11)
Income tax benefit (expense) | 1 | 6
Less: |  |
Balance as of end-of-period | 8,425 | 6,482
Unrealized Gain (Loss) on AFS Securities [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance as of beginning-of-year | 45 |
Unrealized OTTI on AFS Securities [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance as of beginning-of-year | 45 | 33
(Increases) attributable to: |  |
Gross OTTI recognized in OCI during the period |  | (16)
Change in DAC, VOBA, DSI and DFEL |  | 1
Income tax benefit (expense) |  | 3
Decreases attributable to |  |
Changes in fair value, sales, maturities or other settlements of AFS securities |  | 21
Change in DAC, VOBA, DSI, and DFEL |  | (2)
Income tax benefit (expense) |  | (4)
Less: |  |
Balance as of end-of-period |  | 36
Unrealized OTTI on AFS Securities [Member] | Cumulative Effect, Period of Adoption, Adjustment [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 | (11) | 139
Unrealized holding gains (losses) arising during the period | (219) | (152)
Change in foreign currency exchange rate adjustment | (16) | 80
Decreases attributable to |  |
Change in DAC, VOBA, DSI and DFEL | (64) | (3)
Income tax benefit (expense) | 62 | 15
Less: |  |
Reclassification adjustment for gains (losses) included in net income (loss) | 38 | 34
Associated amortization of DAC, VOBA, DSI and DFEL | (8) | (1)
Income tax benefit (expense) | (6) | (7)
Balance as of end-of-period | (272) | 53
Foreign Currency Translation Adjustment [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance as of beginning-of-year | (17) | (23)
Change in foreign currency exchange rate adjustment | (4) | (5)
Less: |  |
Balance as of end-of-period | (21) | (28)
Funded Status of Employee Benefit Plans [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance as of beginning-of-year | (327) | (299)
Less: |  |
Adjustment arising during the period | 4 | 4
Balance as of end-of-period | $ (323) | $ (295)

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