Loans, Lending Commitments and Related Allowance for Credit Losses - Loans by Interest Rate Type (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	$ 53,501	$ 52,997
Floating or Adjustable Rate	164,860	166,812
Corporate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	0	0
Floating or Adjustable Rate	16,826	18,620
Secured lending facilities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	0	0
Floating or Adjustable Rate	42,256	42,659
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	142	141
Floating or Adjustable Rate	8,752	8,746
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	29,335	28,934
Floating or Adjustable Rate	32,006	31,464
Securities-based lending and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	24,024	23,922
Floating or Adjustable Rate	$ 65,020	$ 65,323