Fair Value Measurement - Level 3 Analysis (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Non-trading loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, assets	$ 61	$ 276	$ 730	$ 1,193
Transfers from level 3 into level 2, assets	130	59	353	236
Realized/unrealized gains, assets	157	110	266	133
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets fair value	1,662,857		1,662,857		$ 1,130,863
Recurring | Derivative payables | Equity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, liabilities			1,100
Transfers from level 3 into level 2, liabilities			1,300	1,200
Recurring | Derivative payables | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, liabilities				1,800
Recurring | Derivative receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase in level 3 assets			1,800
Recurring | Derivative receivables | Equity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, assets			841	1,200
Transfers from level 3 into level 2, assets			765	1,700
Recurring | Non-trading loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, assets				1,200
Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets fair value	25,573		25,573		$ 23,656
Increase in level 3 assets			1,900
Realized/unrealized gains, assets	1,300	1,700	1,100	1,900
Realized/unrealized gains (losses), liabilities	$ (1,800)	$ 788	$ (2,300)	$ (1,000)