Loans, Lending Commitments and Related Allowance for Credit Losses - Loans by Interest Rate Type (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	$ 55,397	$ 52,997
Floating or Adjustable Rate	176,581	166,812
Corporate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	0	0
Floating or Adjustable Rate	15,397	18,620
Secured lending facilities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	0	0
Floating or Adjustable Rate	49,341	42,659
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	141	141
Floating or Adjustable Rate	8,700	8,746
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	30,492	28,934
Floating or Adjustable Rate	34,510	31,464
Securities-based lending and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	24,764	23,922
Floating or Adjustable Rate	$ 68,633	$ 65,323