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Shares And Stockholders' Equity (Schedule of Reclassifications Out Of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total realized gain (loss) | $ (39) | $ (114)
Net investment income | 1,238 | 1,172
Interest and debt expense | 64 | 68
Commissions and other expenses | 1,015 | 976
Income (loss) from continuing operations before taxes | 475 | 235
Federal income tax expense (benefit) | 40 | 24
Net income (loss) | 435 | 211
Unrealized Gain (Loss) on AFS Securities [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Income (loss) from continuing operations before taxes | (10) | (46)
Federal income tax expense (benefit) | 4 | 16
Net income (loss) | (6) | (30)
Unrealized Gain (Loss) on Derivative Instruments [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Income (loss) from continuing operations before taxes | 7 | 6
Federal income tax expense (benefit) | (2) | (2)
Net income (loss) | 5 | 4
Gross Reclassification [Member] | Unrealized Gain (Loss) on AFS Securities [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total realized gain (loss) | (3) | (44)
Gross Reclassification [Member] | Unrealized Gain (Loss) on Derivative Instruments [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Nonoperating income expense | 7 | 7
Gross Reclassification [Member] | Unrealized Gain (Loss) on Derivative Instruments [Member] | Interest rate contracts [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net investment income | 2 | 1
Interest and debt expense | (4) |
Gross Reclassification [Member] | Unrealized Gain (Loss) on Derivative Instruments [Member] | Foreign currency contracts [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total realized gain (loss) | 5 |
Net investment income | 4 | 6
Associated amortization of DAC, VOBA, DSI and DFEL [Member] | Unrealized Gain (Loss) on AFS Securities [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total realized gain (loss) | $ (7) | (2)
Associated amortization of DAC, VOBA, DSI and DFEL [Member] | Unrealized Gain (Loss) on Derivative Instruments [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Commissions and other expenses |  | $ (1)

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