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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net gains (losses) on financial instruments at fair value and foreign exchange	$ 24	$ (26)	$ (39)	$ (4)
Income (loss) before income taxes	(106)	(207)	(439)	(226)
Net income (loss)	(106)	(207)	(439)	(228)
Amounts reclassified from AOCI [Member]
Net income (loss)	4	(44)	5	(37)
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange	5	(16)	8	23
Net investment losses related to OTTI	0	(9)	0	(37)
Income (loss) before income taxes	5	(25)	8	(14)
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	$ (1)	$ (19)	$ (3)	$ (23)

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