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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | $ 6,493 | $ 5,754
Total financial instruments owned, at fair value | 1,924 | 1,488
Other assets | 292 | 188
Total financial assets at fair value | 8,709 | 7,430
Financial instruments sold, not yet purchased, at fair value | 293 | 193
Accounts payable, accrued expenses and other liabilities | 260 | 144
Total Financial Liabilities at Fair Value | 553 | 337
US And Foreign Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 6,460 | 5,684
Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 33 | 70
Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1,763 | 1,023
Financial instruments sold, not yet purchased, at fair value | 116 | 77
Options Owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 84 | 354
Financial instruments sold, not yet purchased, at fair value | 96 | 104
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 | 54 | 39
Customer-Held Fractional Shares [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 260 | 144
Other Investments In Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 32 | 44
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 | 260 | 144
Mutual Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 2 |
Precious Metals [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 21 | 12
Financial instruments sold, not yet purchased, at fair value | 18 | 7
Currency Forward Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value |  | 60
Financial instruments sold, not yet purchased, at fair value | 63 | 5
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 6,460 | 5,684
Total financial instruments owned, at fair value | 1,903 | 1,416
Other assets | 292 | 188
Total financial assets at fair value | 8,655 | 7,288
Financial instruments sold, not yet purchased, at fair value | 212 | 181
Accounts payable, accrued expenses and other liabilities | 260 | 144
Total Financial Liabilities at Fair Value | 472 | 325
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 | 6,460 | 5,684
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 | 1,763 | 1,023
Financial instruments sold, not yet purchased, at fair value | 116 | 77
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 | 84 | 354
Financial instruments sold, not yet purchased, at fair value | 96 | 104
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 | 54 | 39
Level 1 [Member] | Customer-Held Fractional Shares [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 260 | 144
Level 1 [Member] | Other Investments In Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 32 | 44
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 | 260 | 144
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 |
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 33 | 70
Total financial instruments owned, at fair value | 21 | 72
Total financial assets at fair value | 54 | 142
Financial instruments sold, not yet purchased, at fair value | 81 | 12
Total Financial Liabilities at Fair Value | 81 | 12
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 | 70
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 | 21 | 12
Financial instruments sold, not yet purchased, at fair value | 18 | 7
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 |  | 60
Financial instruments sold, not yet purchased, at fair value | $ 63 | $ 5

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