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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($) $ in Millions | Sep. 30, 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 | 659 | 630
Other assets - other investments at fair value | 106 | 80
Total financial assets at fair value | 4,690 | 5,460
Financial instruments sold, not yet purchased, at fair value | 233 | 153
Total Financial Liabilities at Fair Value | 233 | 153
Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 582 | 559
Financial instruments sold, not yet purchased, at fair value | 149 | 120
Options Owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 31 | 28
Financial instruments sold, not yet purchased, at fair value | 32 | 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 | 33 | 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 | 11 |
Financial instruments sold, not yet purchased, at fair value | 5 |
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 | 9
Financial instruments sold, not yet purchased, at fair value | 47 | 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 | 646 | 619
Other assets - other investments at fair value | 106 | 80
Total financial assets at fair value | 4,677 | 5,449
Financial instruments sold, not yet purchased, at fair value | 181 | 146
Total Financial Liabilities at Fair Value | 181 | 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 | 582 | 558
Financial instruments sold, not yet purchased, at fair value | 149 | 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 | 31 | 28
Financial instruments sold, not yet purchased, at fair value | 32 | 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 | 33 | 33
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 12 | 9
Total financial assets at fair value | 12 | 9
Financial instruments sold, not yet purchased, at fair value | 52 | 7
Total Financial Liabilities at Fair Value | 52 | 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 | 11 |
Financial instruments sold, not yet purchased, at fair value | 5 |
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 | 9
Financial instruments sold, not yet purchased, at fair value | 47 | 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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