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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | $ 5,726 | $ 4,723
Total financial instruments owned, at fair value | 1,324 | 485
Other assets | 281 | 205
Total financial assets at fair value | 7,331 | 5,413
Financial instruments sold, not yet purchased, at fair value | 198 | 146
Accounts payable, accrued expenses and other liabilities | 230 | 171
Total Financial Liabilities at Fair Value | 428 | 317
US And Foreign Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 5,687 | 4,641
Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 39 | 82
Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 386 | 380
Financial instruments sold, not yet purchased, at fair value | 145 | 121
Options Owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 374 | 31
Financial instruments sold, not yet purchased, at fair value | 34 | 16
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 | 551 | 35
Customer-Held Fractional Shares [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 124 | 91
Crypto-Asses Safeguarding Asset [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 106 | 80
Other Investments In Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 51 | 34
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 | 124 | 91
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 | 106 | 80
Precious Metals [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 11 | 9
Financial instruments sold, not yet purchased, at fair value | 7 | 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 | 2 | 30
Financial instruments sold, not yet purchased, at fair value | 12 | 2
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 5,687 | 4,641
Total financial instruments owned, at fair value | 1,311 | 446
Other assets | 175 | 125
Total financial assets at fair value | 7,173 | 5,212
Financial instruments sold, not yet purchased, at fair value | 179 | 137
Accounts payable, accrued expenses and other liabilities | 124 | 91
Total Financial Liabilities at Fair Value | 303 | 228
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 | 5,687 | 4,641
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 | 386 | 380
Financial instruments sold, not yet purchased, at fair value | 145 | 121
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 | 374 | 31
Financial instruments sold, not yet purchased, at fair value | 34 | 16
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 | 551 | 35
Level 1 [Member] | Customer-Held Fractional Shares [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 124 | 91
Level 1 [Member] | Other Investments In Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 51 | 34
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 | 124 | 91
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 39 | 82
Total financial instruments owned, at fair value | 13 | 39
Other assets | 106 | 80
Total financial assets at fair value | 158 | 201
Financial instruments sold, not yet purchased, at fair value | 19 | 9
Accounts payable, accrued expenses and other liabilities | 106 | 80
Total Financial Liabilities at Fair Value | 125 | 89
Level 2 [Member] | Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 39 | 82
Level 2 [Member] | Crypto-Asses Safeguarding Asset [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 106 | 80
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 | 106 | 80
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 | 11 | 9
Financial instruments sold, not yet purchased, at fair value | 7 | 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 | 2 | 30
Financial instruments sold, not yet purchased, at fair value | $ 12 | $ 2

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