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Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net gains (losses) on financial instruments at fair value and foreign exchange | $ (38) | $ 52 | $ (17)
Income (loss) before income taxes | (578) | (357) | (296)
Net income (loss) | (578) | (359) | (296)
Amounts reclassified from AOCI [Member] |  |  |
Net income (loss) | 13 | (40) | 0
Unrealized gains (losses) on AFS, net [Member] |  |  |
Net income (loss) | 19 | (12) | 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 | 19 | 14 | 6
Net investment losses related to OTTI | 0 | (25) | (5)
Net investment income | 0 | (1) | (1)
Income (loss) before income taxes | 19 | (12) | 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 | $ (6) | $ (28) | $ 0

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