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Shares and Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2017 | Jun. 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 | $ (10) |  | $ (36)
Less: |  |  |
Balance as of end-of-period |  | 2,711 |
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 |  | 2,058 | 5,394
Change in foreign currency exchange rate adjustment |  | 69 | (33)
Change in DAC, VOBA, DSI, future contract benefits and other contract holder funds |  | (356) | (1,620)
Income tax benefit (expense) |  | (626) | (1,321)
Less: |  |  |
Reclassification adjustment for gains (losses) included in net income (loss) |  | (13) | (101)
Associated amortization of DAC, VOBA, DSI, and DFEL |  | (11) | (7)
Income tax benefit (expense) |  | 8 | 38
Less: |  |  |
Balance as of end-of-period | 3,481 | 2,945 | 3,481
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 |  |  | (36)
Change in DAC, VOBA, DSI and DFEL |  |  | 8
Income tax benefit (expense) |  |  | 10
Decreases attributable to |  |  |
Changes in fair value, sales, maturities or other settlements of AFS securities |  | 21 | 5
Change in DAC, VOBA, DSI, and DFEL |  | (4) | (1)
Income tax benefit (expense) |  | (6) | (2)
Less: |  |  |
Balance as of end-of-period | 10 | 36 | 10
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 |  | 46 | (208)
Change in foreign currency exchange rate adjustment |  | (75) | 35
Decreases attributable to |  |  |
Change in DAC, VOBA, DSI and DFEL |  | (8) | (6)
Income tax benefit (expense) |  | 13 | 62
Less: |  |  |
Reclassification adjustment for gains (losses) included in net income (loss) |  | 7 | 9
Associated amortization of DAC, VOBA, DSI and DFEL |  | (2) | (1)
Income tax benefit (expense) |  | (2) | (3)
Balance as of end-of-period | 10 | 22 | 10
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 |  | 7 | (13)
Less: |  |  |
Balance as of end-of-period | (18) | (20) | (18)
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 |  | (7) | 11
Balance as of end-of-period | $ (288) | $ (272) | $ (288)

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