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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, 2020 | Mar. 31, 2019
Income (loss) before income taxes | $ (333) | $ (19)
Net income (loss) | (333) | (21)
Amounts reclassified from AOCI [Member] |  |
Net income (loss) | 1 | 7
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member] |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 3 | 39
Net investment losses related to OTTI | 0 | (28)
Income (loss) before income taxes | 3 | 11
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 | $ (2) | $ (4)

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