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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | $ 4,974 | $ 3,797
Total financial instruments owned, at fair value | 452 | 1,916
Other assets - other investments at fair value | 48 | 36
Total financial assets at fair value | 5,474 | 5,749
Financial instruments sold, not yet purchased, at fair value | 187 | 457
Total Financial Liabilities at Fair Value | 187 | 457
Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 376 | 540
Financial instruments sold, not yet purchased, at fair value | 158 | 183
Options owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 29 | 1,333
Financial instruments sold, not yet purchased, at fair value | 27 | 273
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 | 28 | 34
Corporate Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 3 | 3
Currency Forward Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 16 | 6
Financial instruments sold, not yet purchased, at fair value | 2 | 1
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 4,974 | 3,797
Total financial instruments owned, at fair value | 432 | 1,907
Other assets - other investments at fair value | 48 | 36
Total financial assets at fair value | 5,454 | 5,740
Financial instruments sold, not yet purchased, at fair value | 185 | 456
Total Financial Liabilities at Fair Value | 185 | 456
Level 1 | Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 375 | 540
Financial instruments sold, not yet purchased, at fair value | 158 | 183
Level 1 | Options owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 29 | 1,333
Financial instruments sold, not yet purchased, at fair value | 27 | 273
Level 1 | 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 | 28 | 34
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 16 | 6
Total financial assets at fair value | 16 | 6
Financial instruments sold, not yet purchased, at fair value | 2 | 1
Total Financial Liabilities at Fair Value | 2 | 1
Level 2 | Currency Forward Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 16 | 6
Financial instruments sold, not yet purchased, at fair value | 2 | 1
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 4 | 3
Total financial assets at fair value | 4 | 3
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 | $ 3 | $ 3

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