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Shares and Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 |  | $ (55) | $ (30)
Less: |  |  |
Balance as of end-of-period | 3,230 | 1,566 |
Unrealized Gain (Loss) on AFS Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance as of beginning-of-year | 1,784 | 991 | 3,213
Unrealized holding gains (losses) arising during the year | 3,032 | 1,600 | (4,541)
Change in foreign currency exchange rate adjustment | 134 | (99) | (45)
Change in DAC, VOBA, DSI, future contract benefits and other contract holder funds | (705) | (456) | 1,294
Income tax benefit (expense) | (797) | (370) | 1,147
Less: |  |  |
Reclassification adjustment for gains (losses) included in net income (loss) | (39) | (158) | 145
Associated amortization of DAC, VOBA, DSI, and DFEL | (20) | (23) | (27)
Income tax benefit (expense) | 21 | 63 | (41)
Less: |  |  |
Balance as of end-of-period | 3,486 | 1,784 | 991
Unrealized OTTI on AFS Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance as of beginning-of-year | 25 | 26 | 26
(Increases) attributable to: |  |  |
Gross OTTI recognized in OCI during the period |  | (55) | (30)
Change in DAC, VOBA, DSI and DFEL |  | 12 | 4
Income tax benefit (expense) |  | 15 | 9
Decreases attributable to |  |  |
Changes in fair value, sales, maturities or other settlements of AFS securities | 34 | 54 | 43
Change in DAC, VOBA, DSI, and DFEL | (5) | (12) | (17)
Income tax benefit (expense) | (10) | (15) | (9)
Less: |  |  |
Balance as of end-of-period | 44 | 25 | 26
Unrealized Gain (Loss) on Derivative Instruments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance as of beginning-of-year | 49 | 132 | 139
Unrealized holding gains (losses) arising during the year | 27 | (215) | (241)
Change in foreign currency exchange rate adjustment | (137) | 96 | 48
Decreases attributable to |  |  |
Change in DAC, VOBA, DSI and DFEL | 2 | 3 | 2
Income tax benefit (expense) | 38 | 41 | 66
Less: |  |  |
Reclassification adjustment for gains (losses) included in net income (loss) | 13 | 14 | (183)
Associated amortization of DAC, VOBA, DSI and DFEL | (1) | (1) | 1
Income tax benefit (expense) | (4) | (5) | 64
Balance as of end-of-period | (29) | 49 | 132
Foreign Currency Translation Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance as of beginning-of-year | (27) | (5) | (3)
Change in foreign currency exchange rate adjustment | 13 | (22) | (2)
Less: |  |  |
Balance as of end-of-period | (14) | (27) | (5)
Funded Status of Employee Benefit Plans [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance as of beginning-of-year | (265) | (299) | (279)
Less: |  |  |
Adjustment arising during the period | 18 | 43 | (21)
Income tax benefit (expense) | (10) | (9) | 1
Balance as of end-of-period | $ (257) | $ (265) | $ (299)

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