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Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Net gains (losses) on financial instruments at fair value and foreign exchange | $ (20) | $ 24 | $ 31 | $ (39)
Income (loss) before income taxes | (61) | (106) | (167) | (439)
Net income (loss) | (61) | (106) | (167) | (439)
Amounts reclassified from AOCI [Member] |  |  |  |
Net income (loss) | (1) | 4 | (16) | 5
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 | 5 | 8 | 8
Income (loss) before income taxes | 3 | 5 | 8 | 8
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) | $ (1) | $ (24) | $ (3)

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