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Shares And Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance as of beginning-of-year | $ 407 |  |
(Increases) attributable to: |  |  |
Change in DAC, VOBA, DSI and DFEL | 1 |  |
Less: |  |  |
Balance as of end-of-period | 6,248 |  |
Unrealized Gain (Loss) on AFS Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance as of beginning-of-year | 557 | $ 3,486 |
Cumulative effect from adoption of new accounting standards |  |  | $ 674
Unrealized holding gains (losses) arising during the period | 9,849 | (5,520) |
Change in foreign currency exchange rate adjustment | (80) | (68) |
Change in DAC, VOBA, DSI, future contract benefits and other contract holder funds | (2,271) | 1,538 |
Income tax benefit (expense) | (1,596) | 858 |
Less: |  |  |
Reclassification adjustment for gains (losses) included in net income (loss) | (18) | (35) |
Associated amortization of DAC, VOBA, DSI, and DFEL | (11) | (15) |
Income tax benefit (expense) | 6 | 11 |
Less: |  |  |
Balance as of end-of-period | 6,482 | 1,007 |
Unrealized OTTI on AFS Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance as of beginning-of-year | 33 | 44 |
Cumulative effect from adoption of new accounting standards |  |  | 9
(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 | (8) |
Change in DAC, VOBA, DSI, and DFEL | (2) | (10) |
Income tax benefit (expense) | (4) | 4 |
Less: |  |  |
Balance as of end-of-period | 36 | 39 |
Unrealized Gain (Loss) on Derivative Instruments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance as of beginning-of-year | 139 | (29) |
Cumulative effect from adoption of new accounting standards |  |  | (6)
Unrealized holding gains (losses) arising during the period | (152) | 98 |
Change in foreign currency exchange rate adjustment | 80 | 69 |
Decreases attributable to |  |  |
Change in DAC, VOBA, DSI and DFEL | (3) | 8 |
Income tax benefit (expense) | 15 | (37) |
Less: |  |  |
Reclassification adjustment for gains (losses) included in net income (loss) | 34 | 15 |
Associated amortization of DAC, VOBA, DSI and DFEL | (1) | (1) |
Income tax benefit (expense) | (7) | (3) |
Balance as of end-of-period | 53 | 92 |
Foreign Currency Translation Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance as of beginning-of-year | (23) | (14) |
Change in foreign currency exchange rate adjustment | (5) | (6) |
Less: |  |  |
Balance as of end-of-period | (28) | (20) |
Funded Status of Employee Benefit Plans [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance as of beginning-of-year | (299) | (257) |
Cumulative effect from adoption of new accounting standards |  |  | $ (35)
Less: |  |  |
Adjustment arising during the period | 4 | 10 |
Balance as of end-of-period | $ (295) | $ (282) |

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