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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | $ 6,394 | $ 6,493
Total financial instruments owned, at fair value | 3,406 | 1,924
Other assets | 322 | 292
Total financial assets at fair value | 10,122 | 8,709
Financial instruments sold, not yet purchased, at fair value | 252 | 293
Accounts payable, accrued expenses and other liabilities | 279 | 260
Total Financial Liabilities at Fair Value | 531 | 553
US And Foreign Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 6,361 | 6,460
Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 33 | 33
Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 2,296 | 1,763
Financial instruments sold, not yet purchased, at fair value | 112 | 116
Options Owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 152 | 84
Financial instruments sold, not yet purchased, at fair value | 100 | 96
U.S. And Foreign Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 928 | 54
Customer-Held Fractional Shares [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 279 | 260
Other Investments In Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 43 | 32
Fractional Shares Repurchase Obligation [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Accounts payable, accrued expenses and other liabilities | 279 | 260
Mutual Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 2 | 2
Precious Metals [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 27 | 21
Financial instruments sold, not yet purchased, at fair value | 23 | 18
Currency Forward Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1 |
Financial instruments sold, not yet purchased, at fair value | 17 | 63
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 6,361 | 6,460
Total financial instruments owned, at fair value | 3,378 | 1,903
Other assets | 322 | 292
Total financial assets at fair value | 10,061 | 8,655
Financial instruments sold, not yet purchased, at fair value | 212 | 212
Accounts payable, accrued expenses and other liabilities | 279 | 260
Total Financial Liabilities at Fair Value | 491 | 472
Level 1 [Member] | US And Foreign Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 6,361 | 6,460
Level 1 [Member] | Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 2,296 | 1,763
Financial instruments sold, not yet purchased, at fair value | 112 | 116
Level 1 [Member] | Options Owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 152 | 84
Financial instruments sold, not yet purchased, at fair value | 100 | 96
Level 1 [Member] | U.S. And Foreign Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 928 | 54
Level 1 [Member] | Customer-Held Fractional Shares [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 279 | 260
Level 1 [Member] | Other Investments In Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 43 | 32
Level 1 [Member] | Fractional Shares Repurchase Obligation [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Accounts payable, accrued expenses and other liabilities | 279 | 260
Level 1 [Member] | Mutual Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 2 | 2
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 33 | 33
Total financial instruments owned, at fair value | 28 | 21
Total financial assets at fair value | 61 | 54
Financial instruments sold, not yet purchased, at fair value | 40 | 81
Total Financial Liabilities at Fair Value | 40 | 81
Level 2 [Member] | Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 33 | 33
Level 2 [Member] | Precious Metals [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 27 | 21
Financial instruments sold, not yet purchased, at fair value | 23 | 18
Level 2 [Member] | Currency Forward Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1 |
Financial instruments sold, not yet purchased, at fair value | $ 17 | $ 63

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