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Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Net gains (losses) on financial instruments at fair value and foreign exchange | $ 22 | $ (9)
Income (loss) before income taxes | (19) | (96)
Provision (benefit) for income taxes | (2) | 2
Net income (loss) | (17) | (98)
Amounts reclassified from AOCI [Member] |  |
Net income (loss) | 7 | 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 | 39 | 1
Other-than-temporary impairments recognized in accumulated other comprehensive income (loss) | (28) | (1)
Income (loss) before income taxes | 11 | 0
Instrument-specific credit risk of liabilities measured at fair value, net [Member] | Amounts reclassified from AOCI [Member] |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | (4) | 0
Income (loss) before income taxes | $ (4) | $ 0

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