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Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Net gains (losses) on financial instruments at fair value and foreign exchange | $ 63 | $ 78 | $ 69
Income (loss) before income taxes | 289 | 641 | 416
Provision (benefit) for income taxes | 109 | 72 | 166
Net income (loss) | 180 | 569 | 250
Amounts reclassified from AOCI [Member] |  |  |
Net income (loss) | 1 | (17) | 16
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member] |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 11 | (17) | 23
Other-than-temporary impairments recognized in accumulated other comprehensive income (loss) | (4) | 0 | 0
Net investment income | (4) | (4) | (5)
Income (loss) before income taxes | 3 | (21) | 18
Provision (benefit) for income taxes | 2 | (8) | 7
Net income (loss) | 1 | (13) | 11
Foreign currency translation, net [Member] | Amounts reclassified from AOCI [Member] |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | $ 0 | $ (4) | $ 5

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