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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | $ 3,925 | $ 4,750
Total financial instruments owned, at fair value | 640 | 630
Other assets - other investments at fair value | 179 | 80
Total financial assets at fair value | 4,744 | 5,460
Financial instruments sold, not yet purchased, at fair value | 191 | 153
Total Financial Liabilities at Fair Value | 191 | 153
Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 545 | 559
Financial instruments sold, not yet purchased, at fair value | 143 | 120
Options Owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 30 | 28
Financial instruments sold, not yet purchased, at fair value | 30 | 26
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 | 55 | 33
Corporate Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1 | 1
Precious Metals [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 9 |
Currency Forward Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value |  | 9
Financial instruments sold, not yet purchased, at fair value | 18 | 7
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 3,925 | 4,750
Total financial instruments owned, at fair value | 630 | 619
Other assets - other investments at fair value | 179 | 80
Total financial assets at fair value | 4,734 | 5,449
Financial instruments sold, not yet purchased, at fair value | 173 | 146
Total Financial Liabilities at Fair Value | 173 | 146
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 | 545 | 558
Financial instruments sold, not yet purchased, at fair value | 143 | 120
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 | 30 | 28
Financial instruments sold, not yet purchased, at fair value | 30 | 26
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 | 55 | 33
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 9 | 9
Total financial assets at fair value | 9 | 9
Financial instruments sold, not yet purchased, at fair value | 18 | 7
Total Financial Liabilities at Fair Value | 18 | 7
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 |
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 |  | 9
Financial instruments sold, not yet purchased, at fair value | 18 | 7
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1 | 2
Total financial assets at fair value | 1 | 2
Level 3 [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
Level 3 [Member] | Corporate Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | $ 1 | $ 1

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