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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Net gains (losses) on financial instruments at fair value and foreign exchange | $ 22 | $ (61) | $ 13 | $ (44)
Income (loss) before income taxes | (146) | (210) | (242) | (330)
Provision (benefit) for income taxes | 0 | 1,019 | 2 | 971
Net income (loss) | (146) | (1,229) | (244) | (1,301)
Amounts reclassified from AOCI [Member] |  |  |  |
Net income (loss) | 0 | 4 | 0 | 4
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member] |  |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 0 | 4 | 1 | 6
Other-than-temporary impairments recognized in accumulated other comprehensive income (loss) | 0 | 0 | (1) | (2)
Net investment income | 0 | (1) | 0 | (1)
Income (loss) before income taxes | 0 | 3 | 0 | 3
Provision (benefit) for income taxes | $ 0 | $ (1) | $ 0 | $ (1)

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