Business Segments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue generated from certain contracts with customers included in non-interest income	$ 1,700	$ 1,700
Lease revenue	238	239
Payment Services [Member]
Rewards and Rebate Costs and Certain Partner Payments Included in Noninterest Income	$ 530	$ 529