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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | $ 7,363 | $ 4,729
Total financial instruments owned, at fair value | 551 | 673
Other assets | 231 | 215
Total financial assets at fair value | 8,145 | 5,617
Financial instruments sold, not yet purchased, at fair value | 218 | 182
Accounts payable, accrued expenses and other liabilities | 184 | 166
Total Financial Liabilities at Fair Value | 402 | 348
US And Foreign Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 7,348 | 4,729
Total financial instruments owned, at fair value | 156 | 54
Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 15 |
Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 354 | 548
Financial instruments sold, not yet purchased, at fair value | 159 | 144
Options Owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 31 | 22
Financial instruments sold, not yet purchased, at fair value | 25 | 22
Customer-Held Fractional Shares [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 112 | 166
Crypto-Asses Safeguarding Asset [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 72 |
Other Investments In Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 47 | 49
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 | 112 | 166
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 | 72 |
Precious Metals [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 9 | 10
Financial instruments sold, not yet purchased, at fair value | 7 | 6
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 | 39
Financial instruments sold, not yet purchased, at fair value | 27 | 10
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 7,348 | 4,729
Total financial instruments owned, at fair value | 541 | 624
Other assets | 159 | 215
Total financial assets at fair value | 8,048 | 5,568
Financial instruments sold, not yet purchased, at fair value | 184 | 166
Accounts payable, accrued expenses and other liabilities | 112 | 166
Total Financial Liabilities at Fair Value | 296 | 332
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 | 7,348 | 4,729
Total financial instruments owned, at fair value | 156 | 54
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 | 354 | 548
Financial instruments sold, not yet purchased, at fair value | 159 | 144
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 | 31 | 22
Financial instruments sold, not yet purchased, at fair value | 25 | 22
Level 1 [Member] | Customer-Held Fractional Shares [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 112 | 166
Level 1 [Member] | Other Investments In Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 47 | 49
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 | 112 | 166
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 15 |
Total financial instruments owned, at fair value | 10 | 49
Other assets | 72 |
Total financial assets at fair value | 97 | 49
Financial instruments sold, not yet purchased, at fair value | 34 | 16
Accounts payable, accrued expenses and other liabilities | 72 |
Total Financial Liabilities at Fair Value | 106 | 16
Level 2 [Member] | Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 15 |
Level 2 [Member] | Crypto-Asses Safeguarding Asset [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 72 |
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 | 72 |
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 | 9 | 10
Financial instruments sold, not yet purchased, at fair value | 7 | 6
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 | 39
Financial instruments sold, not yet purchased, at fair value | $ 27 | $ 10

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