Noninterest Revenue and Noninterest Expense - Card Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Non interest Revenue [Line Items]
Credit cost amortization period	12 months
Direct loan origination costs amortization period	12 months
Total card income	$ 4,420	$ 5,102	$ 4,435
Interchange and merchant processing income
Schedule of Non interest Revenue [Line Items]
Total card income	28,085	23,592	18,563
Reward costs and partner payments
Schedule of Non interest Revenue [Line Items]
Total card income	(22,162)	(17,868)	(13,637)
Other card income
Schedule of Non interest Revenue [Line Items]
Total card income	$ (1,503)	$ (622)	$ (491)
Deferred revenues, recognition period	12 months
Minimum
Schedule of Non interest Revenue [Line Items]
Credit card revenue sharing agreement terms	5 years
Maximum
Schedule of Non interest Revenue [Line Items]
Credit card revenue sharing agreement terms	10 years