Fair Values of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	$ 21,856	$ 15,936
Investments segregated and on deposit for regulatory purposes:	18,865	23,555
Fair Value	61,090	62,357
Other assets:	3,129	3,163
Total assets	104,940	105,011
Total accrued expenses and other liabilities	2,842	2,845
Total liabilities	2,842	2,845
Money market funds
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	21,565	13,947
Commercial paper
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	291
U.S. Treasury securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:		1,989
Fair Value	11,336	11,364
U.S. government securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Investments segregated and on deposit for regulatory purposes:	18,865	23,555
Other assets:	5	15
U.S. agency mortgage-backed securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	39,691	41,434
Corporate debt securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	4,785	4,667
Asset-backed securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	4,589	4,199
U.S. state and municipal securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	558	561
Non-agency commercial mortgage-backed securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	113	113
Other
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	18	19
Total other securities owned
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	3,128	3,162
Equity, corporate debt, and other securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	1,788	1,788
Mutual funds and ETFs
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	1,310	1,314
State and municipal debt obligations
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	25	45
Interest rate swaps
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	1	1
Total accrued expenses and other liabilities	2	1
Other
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Total accrued expenses and other liabilities	2,840	2,844
Level 1
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	21,565	13,947
Investments segregated and on deposit for regulatory purposes:	0	0
Fair Value	0	0
Other assets:	3,015	3,018
Total assets	24,580	16,965
Total accrued expenses and other liabilities	2,807	2,804
Total liabilities	2,807	2,804
Level 1 \| Money market funds
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	21,565	13,947
Level 1 \| Commercial paper
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	0
Level 1 \| U.S. Treasury securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:		0
Fair Value	0	0
Level 1 \| U.S. government securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Investments segregated and on deposit for regulatory purposes:	0	0
Other assets:	0	0
Level 1 \| U.S. agency mortgage-backed securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 1 \| Corporate debt securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 1 \| Asset-backed securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 1 \| U.S. state and municipal securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 1 \| Non-agency commercial mortgage-backed securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 1 \| Other
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 1 \| Total other securities owned
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	3,015	3,018
Level 1 \| Equity, corporate debt, and other securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	1,705	1,704
Level 1 \| Mutual funds and ETFs
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	1,310	1,314
Level 1 \| State and municipal debt obligations
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	0	0
Level 1 \| Interest rate swaps
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	0	0
Total accrued expenses and other liabilities	0	0
Level 1 \| Other
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Total accrued expenses and other liabilities	2,807	2,804
Level 2
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	291	1,989
Investments segregated and on deposit for regulatory purposes:	18,865	23,555
Fair Value	61,090	62,357
Other assets:	114	145
Total assets	80,360	88,046
Total accrued expenses and other liabilities	35	41
Total liabilities	35	41
Level 2 \| Money market funds
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	0	0
Level 2 \| Commercial paper
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	291
Level 2 \| U.S. Treasury securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:		1,989
Fair Value	11,336	11,364
Level 2 \| U.S. government securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Investments segregated and on deposit for regulatory purposes:	18,865	23,555
Other assets:	5	15
Level 2 \| U.S. agency mortgage-backed securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	39,691	41,434
Level 2 \| Corporate debt securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	4,785	4,667
Level 2 \| Asset-backed securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	4,589	4,199
Level 2 \| U.S. state and municipal securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	558	561
Level 2 \| Non-agency commercial mortgage-backed securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	113	113
Level 2 \| Other
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	18	19
Level 2 \| Total other securities owned
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	113	144
Level 2 \| Equity, corporate debt, and other securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	83	84
Level 2 \| Mutual funds and ETFs
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	0	0
Level 2 \| State and municipal debt obligations
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	25	45
Level 2 \| Interest rate swaps
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	1	1
Total accrued expenses and other liabilities	2	1
Level 2 \| Other
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Total accrued expenses and other liabilities	33	40
Level 3
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	0	0
Investments segregated and on deposit for regulatory purposes:	0	0
Fair Value	0	0
Other assets:	0	0
Total assets	0	0
Total accrued expenses and other liabilities	0	0
Total liabilities	0	0
Level 3 \| Money market funds
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	0	0
Level 3 \| Commercial paper
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	0
Level 3 \| U.S. Treasury securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:		0
Fair Value	0	0
Level 3 \| U.S. government securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Investments segregated and on deposit for regulatory purposes:	0	0
Other assets:	0	0
Level 3 \| U.S. agency mortgage-backed securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 3 \| Corporate debt securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 3 \| Asset-backed securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 3 \| U.S. state and municipal securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 3 \| Non-agency commercial mortgage-backed securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 3 \| Other
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Level 3 \| Total other securities owned
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	0	0
Level 3 \| Equity, corporate debt, and other securities
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	0	0
Level 3 \| Mutual funds and ETFs
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	0	0
Level 3 \| State and municipal debt obligations
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	0	0
Level 3 \| Interest rate swaps
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets:	0	0
Total accrued expenses and other liabilities	0	0
Level 3 \| Other
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Total accrued expenses and other liabilities	$ 0	$ 0

Cash And Securities Segregated Under Federal And Other Regulations, Fair Value Disclosure

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- Definition

Fair value portion of trade and related party payables and accrued expenses.

+ References

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- Definition

Fair value portion of asset recognized for present right to economic benefit.

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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- Definition

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Fair value of financial and nonfinancial obligations.

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- Definition

Fair value portion of other assets.

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