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Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income (loss) before income taxes | $ (357) | $ (296) | $ (661)
Provision (benefit) for income taxes | 2 | 0 | 944
Net income (loss) | (359) | (296) | (1,605)
Amounts reclassified from AOCI [Member] |  |  |
Net income (loss) | (40) | 0 | (8)
Unrealized gains (losses) on AFS, net [Member] |  |  |
Net income (loss) | (12) | 0 | (8)
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member] |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 14 | 6 | 3
Net investment losses related to OTTI | (25) | (5) | (7)
Net investment income | (1) | (1) | (5)
Income (loss) before income taxes | (12) | 0 | (9)
Provision (benefit) for income taxes | 0 | 0 | (1)
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 | $ (28) | $ 0 | $ 0

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