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Shares And Stockholders' Equity (Schedule of Reclassifications Out Of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total realized gain (loss) | $ (362) | $ 12
Net investment income | 1,251 | 1,233
Interest and debt expense | (71) | (91)
Commissions and other expenses | (1,176) | (1,057)
Unrealized Gain (Loss) on AFS Securities [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total realized gain (loss) | (15) | (18)
Reclassifications before income tax benefit (expense) | (16) | (22)
Income tax benefit (expense) | 3 | 5
Reclassifications, net of income tax | (13) | (17)
Unrealized Gain (Loss) on AFS Securities [Member] | Associated amortization of DAC, VOBA, DSI and DFEL [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total realized gain (loss) | (1) | (4)
Unrealized Gain (Loss) on Derivative Instruments [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Nonoperating income expense | 8 | 3
Reclassifications before income tax benefit (expense) | 7 | 2
Income tax benefit (expense) | (1) |
Reclassifications, net of income tax | 6 | 2
Unrealized Gain (Loss) on Derivative Instruments [Member] | Interest rate contracts [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net investment income | 1 | 1
Interest and debt expense | (1) | (3)
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) | 1 |
Net investment income | 7 | 5
Unrealized Gain (Loss) on Derivative Instruments [Member] | Associated amortization of DAC, VOBA, DSI and DFEL [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Commissions and other expenses | $ (1) | $ (1)

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