Fair Value Measurement - Level 3 Analysis (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Long-term debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, liabilities	$ 593	$ 738	$ 229
Transfers from level 3 into level 2, liabilities	2,916	863	729
Realized/unrealized gains (losses), liabilities	(5,039)	(1,475)	(3,010)
Non-trading loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, assets	1,266	816	1,306
Transfers from Level 3 into level 2, assets	723	427	1,065
Realized/unrealized gains (losses), assets	206	266	289
Total debt and equity instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, assets	1,181	1,001	728
Transfers from Level 3 into level 2, assets	1,301	880	1,100
Realized/unrealized gains (losses), assets	(13)	256	0
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets fair value	1,829,852	1,479,913
Recurring | Derivative payables | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, liabilities		1,100	2,100
Transfers from level 3 into level 2, liabilities	1,200
Recurring | Derivative payables | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, liabilities	1,600	1,700	829
Transfers from level 3 into level 2, liabilities	2,700	2,000	1,700
Recurring | Long-term debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 3 into level 2, liabilities	2,900	863
Recurring | Derivative receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase (decrease) in level 3 assets	474
Recurring | Derivative receivables | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, assets	904	959	951
Transfers from Level 3 into level 2, assets	1,300		921
Recurring | Derivative receivables | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, assets	1,600	1,600	1,500
Transfers from Level 3 into level 2, assets	2,100	1,400	2,300
Recurring | Non-trading loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase (decrease) in level 3 assets	646
Transfers from level 2 into level 3, assets	1,300	816	1,300
Transfers from Level 3 into level 2, assets			1,100
Recurring | Total debt and equity instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, assets	1,200	1,000
Transfers from Level 3 into level 2, assets	1,300	880	1,100
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets fair value	25,107	23,783
Increase (decrease) in level 3 assets	1,300
Realized/unrealized gains (losses), assets	4,600	1,900	1,800
Realized/unrealized gains (losses), liabilities	$ (5,700)	$ (1,600)	$ (3,300)