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Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Net gains (losses) on financial instruments at fair value and foreign exchange | $ (9) | $ 17
Income (loss) before income taxes | (96) | (120)
Provision (benefit) for income taxes | 2 | (48)
Net income (loss) | (98) | (72)
Amounts reclassified from AOCI [Member] |  |
Net income (loss) | 0 | 0
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member] |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 1 | 2
Other-than-temporary impairments recognized in accumulated other comprehensive income (loss) | (1) | (2)
Net investment income | 0 | 0
Income (loss) before income taxes | 0 | 0
Provision (benefit) for income taxes | $ 0 | $ 0

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