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Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net gains (losses) on financial instruments at fair value and foreign exchange | $ (17) | $ (24) | $ 84
Income (loss) before income taxes | (296) | (661) | (339)
Provision (benefit) for income taxes | 0 | 944 | (1)
Net income (loss) | (296) | (1,605) | (338)
Amounts reclassified from AOCI [Member] |  |  |
Net income (loss) | 0 | (8) | (1)
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member] |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 6 | 3 | 7
Other-than-temporary impairments recognized in accumulated other comprehensive income (loss) | (5) | (7) | (4)
Net investment income | (1) | (5) | (6)
Income (loss) before income taxes | 0 | (9) | (3)
Provision (benefit) for income taxes | $ 0 | $ (1) | $ (2)

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