Business Segments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue generated from certain contracts with customers included in non-interest income	$ 1,700	$ 1,700
Lease revenue	228	238
Payment Services [Member]
Rewards and Rebate Costs and Certain Partner Payments Included in Noninterest Income	$ 535	$ 530