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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | $ 6,688 | $ 5,754
Total financial instruments owned, at fair value | 2,949 | 1,488
Other assets | 522 | 360
Total financial assets at fair value | 10,159 | 7,602
Financial instruments sold, not yet purchased, at fair value | 381 | 193
Accounts payable, accrued expenses and other liabilities | 468 | 316
Total Financial Liabilities at Fair Value | 849 | 509
US And Foreign Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 6,631 | 5,684
Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 57 | 70
Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1,850 | 1,023
Financial instruments sold, not yet purchased, at fair value | 190 | 77
Options Owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 119 | 354
Financial instruments sold, not yet purchased, at fair value | 172 | 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 | 948 | 39
Customer-Held Fractional Shares [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 226 | 144
Crypto-Asses Safeguarding Asset [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 242 | 172
Other Investments In Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 54 | 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 | 226 | 144
Crypto-Assets Safeguarding Liability [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Accounts payable, accrued expenses and other liabilities | 242 | 172
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 | 20 | 12
Financial instruments sold, not yet purchased, at fair value | 17 | 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 | 10 | 60
Financial instruments sold, not yet purchased, at fair value | 2 | 5
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 6,631 | 5,684
Total financial instruments owned, at fair value | 2,919 | 1,416
Other assets | 280 | 188
Total financial assets at fair value | 9,830 | 7,288
Financial instruments sold, not yet purchased, at fair value | 362 | 181
Accounts payable, accrued expenses and other liabilities | 226 | 144
Total Financial Liabilities at Fair Value | 588 | 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 | 6,631 | 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 | 1,850 | 1,023
Financial instruments sold, not yet purchased, at fair value | 190 | 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 | 119 | 354
Financial instruments sold, not yet purchased, at fair value | 172 | 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 | 948 | 39
Level 1 [Member] | Customer-Held Fractional Shares [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 226 | 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 | 54 | 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 | 226 | 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 | 57 | 70
Total financial instruments owned, at fair value | 30 | 72
Other assets | 242 | 172
Total financial assets at fair value | 329 | 314
Financial instruments sold, not yet purchased, at fair value | 19 | 12
Accounts payable, accrued expenses and other liabilities | 242 | 172
Total Financial Liabilities at Fair Value | 261 | 184
Level 2 [Member] | Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 57 | 70
Level 2 [Member] | Crypto-Asses Safeguarding Asset [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 242 | 172
Level 2 [Member] | Crypto-Assets Safeguarding Liability [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Accounts payable, accrued expenses and other liabilities | 242 | 172
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 | 20 | 12
Financial instruments sold, not yet purchased, at fair value | 17 | 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 | 10 | 60
Financial instruments sold, not yet purchased, at fair value | $ 2 | $ 5

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