Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Allowance for credit losses	$ 3,025	$ 2,657
Security and loan valuations	2,497	0
Rewards programs	790	825
Net unrealized losses on derivatives	689	0
Net operating loss and tax credit carryforwards	437	367
Compensation and employee benefits	411	337
Lease liabilities	346	345
Partnership investments	253	238
Other assets	507	359
Subtotal	8,955	5,128
Valuation allowance	(446)	(355)
Total deferred tax assets	8,509	4,773
Deferred tax liabilities:
Right-of-use assets	284	284
Original issue discount	241	361
Partnership investments	119	128
Mortgage servicing rights	95	88
Security and loan valuations	0	49
Net unrealized gains on derivatives	0	32
Other liabilities	111	123
Total deferred tax liabilities	850	1,065
Net deferred tax assets	$ 7,659	$ 3,708