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Stockholders' Equity - Components of Other Comprehensive Income Loss and Related Tax Impact (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Before Tax
Net unrealized gains (losses) on securities available for sale	$ 855	$ (605)	$ 23
Net changes in securities held to maturity	36	588	150
Net unrealized gains (losses) on hedging relationships	1,016	(98)	(325)
Foreign currency translation adjustments	54	9	3
Other	17	(15)	38
Other comprehensive income (loss), before tax	1,978	(121)	(111)
Provision (Benefit)
Net unrealized gains (losses) on securities available for sale	205	(146)	2
Net changes in securities held to maturity	10	141	53
Net unrealized gains (losses) on hedging relationships	244	(24)	(122)
Foreign currency translation adjustments	(16)	48	(81)
Other	4	(4)	14
Other comprehensive income (loss), provision (benefit)	447	15	(134)
After Tax
Net unrealized gains (losses) on securities available for sale	650	(459)	21
Net changes in securities held to maturity	26	447	97
Net unrealized gains (losses) on hedging relationships	772	(74)	(203)
Foreign currency translation adjustments	70	(39)	84
Other	13	(11)	24
Other comprehensive income (loss), net of tax	$ 1,531	$ (136)	$ 23

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