Business Segments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue generated from certain contracts with customers included in non-interest income	$ 1,600	$ 1,900	$ 3,300	$ 3,600
Lease revenue	230	246	468	485
Payment Services [Member]
Rewards and Rebate Costs and Certain Partner Payments Included in Noninterest Income	$ 445	$ 566	$ 975	$ 1,100