Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Allowance for credit losses	$ 3,538	$ 3,025
Security and loan valuations	2,223	2,497
Rewards programs	801	790
Net operating loss and tax credit carryforwards	514	437
Net unrealized loss on derivatives	470	689
Compensation and employee benefits	444	411
Lease liabilities	314	346
Fixed assets and leases	278	190
Partnership investments	272	253
Other assets	388	317
Subtotal	9,242	8,955
Valuation allowance	(496)	(446)
Total deferred tax assets	8,746	8,509
Deferred tax liabilities:
Right-of-use assets	253	284
Original issue discount	121	241
Partnership investments	148	119
Mortgage servicing rights	85	95
Loan Fees & Expenses	48	52
Goodwill and intangibles	57	0
Other liabilities	95	59
Total deferred tax liabilities	807	850
Net deferred tax assets	$ 7,939	$ 7,659