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Shares and Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance as of beginning-of-year |  |  | $ 1,566 |
(Increases) attributable to: |  |  |  |
Gross OTTI recognized in OCI during the period | $ (1) | $ (12) | (1) | $ (48)
Less: |  |  |  |
Balance as of end-of-period | 2,859 |  | 2,859 |
Unrealized Gain (Loss) on AFS Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance as of beginning-of-year |  |  | 1,784 | 991
Unrealized holding gains (losses) arising during the year |  |  | 2,385 | 5,827
Change in foreign currency exchange rate adjustment |  |  | 112 | (47)
Change in DAC, VOBA, DSI, future contract benefits and other contract holder funds |  |  | (468) | (1,733)
Income tax benefit (expense) |  |  | (717) | (1,429)
Less: |  |  |  |
Reclassification adjustment for gains (losses) included in net income (loss) |  |  | (26) | (131)
Associated amortization of DAC, VOBA, DSI, and DFEL |  |  | (16) | (14)
Income tax benefit (expense) |  |  | 15 | 51
Less: |  |  |  |
Balance as of end-of-period | 3,123 | 3,703 | 3,123 | 3,703
Unrealized OTTI on AFS Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance as of beginning-of-year |  |  | 25 | 26
(Increases) attributable to: |  |  |  |
Gross OTTI recognized in OCI during the period |  |  | (1) | (48)
Change in DAC, VOBA, DSI and DFEL |  |  |  | 11
Income tax benefit (expense) |  |  |  | 12
Decreases attributable to |  |  |  |
Changes in fair value, sales, maturities or other settlements of AFS securities |  |  | 29 | 40
Change in DAC, VOBA, DSI, and DFEL |  |  | (5) | (8)
Income tax benefit (expense) |  |  | (8) | (11)
Less: |  |  |  |
Balance as of end-of-period | 40 | 22 | 40 | 22
Unrealized Gain (Loss) on Derivative Instruments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance as of beginning-of-year |  |  | 49 | 132
Unrealized holding gains (losses) arising during the year |  |  | 31 | (297)
Change in foreign currency exchange rate adjustment |  |  | (119) | 42
Decreases attributable to |  |  |  |
Change in DAC, VOBA, DSI and DFEL |  |  | (3) |
Income tax benefit (expense) |  |  | 32 | 89
Less: |  |  |  |
Reclassification adjustment for gains (losses) included in net income (loss) |  |  | 7 | 12
Associated amortization of DAC, VOBA, DSI and DFEL |  |  | (1) | (1)
Income tax benefit (expense) |  |  | (2) | (4)
Balance as of end-of-period | (14) | (41) | (14) | (41)
Foreign Currency Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance as of beginning-of-year |  |  | (27) | (5)
Change in foreign currency exchange rate adjustment |  |  | 11 | (15)
Less: |  |  |  |
Balance as of end-of-period | (16) | (20) | (16) | (20)
Funded Status of Employee Benefit Plans [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance as of beginning-of-year |  |  | (265) | (299)
Less: |  |  |  |
Adjustment arising during the period |  |  | (9) | 12
Balance as of end-of-period | $ (274) | $ (287) | $ (274) | $ (287)

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