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Shares And Stockholders' Equity (Schedule of Reclassifications Out Of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total realized gain (loss) | $ (117) | $ (7) | $ (480) | $ 5
Net investment income | 1,355 | 1,232 | 2,606 | 2,465
Interest and debt expense | (70) | (68) | (141) | (159)
Commissions and other expenses | $ (1,272) | $ (1,177) | (2,446) | (2,234)
Unrealized Gain (Loss) on AFS Securities [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total realized gain (loss) |  |  | (12) | (29)
Reclassifications before income tax benefit (expense) |  |  | (17) | (39)
Income tax benefit (expense) |  |  | 4 | 8
Reclassifications, net of income tax |  |  | (13) | (31)
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) |  |  | (5) | (10)
Unrealized OTTI on AFS Securities [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total realized gain (loss) |  |  | 5 |
Reclassifications before income tax benefit (expense) |  |  | 5 |
Income tax benefit (expense) |  |  | (1) |
Reclassifications, net of income tax |  |  | 4 |
Unrealized Gain (Loss) on Derivative Instruments [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Nonoperating income expense |  |  | 20 | 11
Reclassifications before income tax benefit (expense) |  |  | 18 | 10
Income tax benefit (expense) |  |  | (4) | (2)
Reclassifications, net of income tax |  |  | 14 | 8
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 | 2
Interest and debt expense |  |  | (1) | (2)
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) |  |  | 4 |
Net investment income |  |  | 15 | 11
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 |  |  | $ (2) | $ (1)

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