Loans, Lending Commitments and Related Allowance for Credit Losses - Employee Loans (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Employee Loans [Line Items]
Other receivables	$ 81,639	$ 80,105
Employee loans	4,353	4,349
ACL	(121)	(121)
Employee loans, net of ACL	$ 4,232	$ 4,228
Remaining repayment term, weighted average in years	5 years 8 months 12 days	5 years 9 months 18 days
Currently employed by the Firm | Related Party
Employee Loans [Line Items]
Other receivables	$ 4,263	$ 4,257
No longer employed by the Firm | Related Party
Employee Loans [Line Items]
Other receivables	$ 90	$ 92