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Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net gains (losses) on financial instruments at fair value and foreign exchange | $ 84 | $ 63 | $ 78
Income (loss) before income taxes | (339) | 289 | 641
Provision (benefit) for income taxes | (1) | 109 | 72
Net income (loss) | (338) | 180 | 569
Amounts reclassified from AOCI [Member] |  |  |
Net income (loss) | (1) | 1 | (17)
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member] |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 7 | 11 | (17)
Other-than-temporary impairments recognized in accumulated other comprehensive income (loss) | (4) | (4) | 0
Net investment income | (6) | (4) | (4)
Income (loss) before income taxes | (3) | 3 | (21)
Provision (benefit) for income taxes | (2) | 2 | (8)
Net income (loss) | (1) | 1 | (13)
Foreign currency translation, net [Member] | Amounts reclassified from AOCI [Member] |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | $ 0 | $ 0 | $ (4)

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