Variable Interest Entities - Credit Card Securitizations (Details) - Firm-sponsored credit card trusts - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Minimum undivided interest in credit card trusts	65.00%	62.00%
Undivided interests in Firm-sponsored credit card securitization trusts	$ 4,900,000,000	$ 6,100,000,000
Senior securities
Variable Interest Entity [Line Items]
Undivided interests in Firm-sponsored credit card securitization trusts	0	0
Subordinated securities
Variable Interest Entity [Line Items]
Undivided interests in Firm-sponsored credit card securitization trusts	$ 1,500,000,000	$ 1,500,000,000
Minimum
Variable Interest Entity [Line Items]
Minimum undivided interest in credit card trusts	5.00%