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Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Net gains (losses) on financial instruments at fair value and foreign exchange | $ 13 | $ 44 | $ (26) | $ 40
Income (loss) before income taxes | (58) | 89 | (497) | (137)
Net income (loss) | (58) | 83 | (497) | (145)
Amounts reclassified from AOCI [Member] |  |  |  |
Net income (loss) | 7 | 31 | 12 | (6)
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member] |  |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 9 | (7) | 17 | 16
Net investment losses related to OTTI | 0 | 42 | 0 | 5
Net investment income | 0 | (1) | 0 | (1)
Income (loss) before income taxes | 9 | 34 | 17 | 20
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) | $ (3) | $ (5) | $ (26)

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