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Stockholders' Equity - Components of Other Comprehensive Income Loss and Related Tax Impact (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Before Tax
Net unrealized gains (losses) on securities available for sale	$ 1,610	$ 384
Net unrealized gains (losses) on hedging relationships	1,808	365
Foreign currency translation adjustments	(21)	19
Net changes in securities held to maturity	0	7
Other	0	(2)
Other comprehensive income (loss), before tax	3,397	773
Provision (Benefit)
Net unrealized gains (losses) on securities available for sale	386	92
Net unrealized gains (losses) on hedging relationships	434	88
Foreign currency translation adjustments	46	(11)
Net changes in securities held to maturity	0	1
Other	0	0
Other comprehensive income (loss), provision (benefit)	866	170
After Tax
Net unrealized gains (losses) on securities available for sale	1,224	292
Net unrealized gains (losses) on hedging relationships	1,374	277
Foreign currency translation adjustments	(67)	30
Net changes in securities held to maturity	0	6
Other	0	(2)
Other comprehensive income, net of tax	$ 2,531	$ 603

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