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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | $ 3,787 | $ 4,213
Total financial instruments owned, at fair value | 1,883 | 2,119
Total Financial Assets at Fair Value | 5,713 | 6,332
Financial instruments sold, not yet purchased, at fair value | 977 | 681
Total Financial Liabilities at Fair Value | 977 | 681
Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 543 | 494
Financial instruments sold, not yet purchased, at fair value | 467 | 273
Options owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1,293 | 1,479
Financial instruments sold, not yet purchased, at fair value | 495 | 404
Warrants And Discount Certificates [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value |  | 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 | 42 | 113
Corporate And Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 3 | 4
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 | 28
Financial instruments sold, not yet purchased, at fair value | 15 | 4
Other Assets - Investments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other fair value investments, included in other assets | 43 |
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 3,787 | 4,213
Total financial instruments owned, at fair value | 1,878 | 2,087
Total Financial Assets at Fair Value | 5,708 | 6,300
Financial instruments sold, not yet purchased, at fair value | 962 | 677
Total Financial Liabilities at Fair Value | 962 | 677
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 | 543 | 494
Financial instruments sold, not yet purchased, at fair value | 467 | 273
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 | 1,293 | 1,479
Financial instruments sold, not yet purchased, at fair value | 495 | 404
Level 1 | Warrants And Discount Certificates [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value |  | 1
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 | 42 | 113
Level 1 | Other Assets - Investments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other fair value investments, included in other assets | 43 |
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 2 | 29
Total Financial Assets at Fair Value | 2 | 29
Financial instruments sold, not yet purchased, at fair value | 15 | 4
Total Financial Liabilities at Fair Value | 15 | 4
Level 2 | Corporate And Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value |  | 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 | 2 | 28
Financial instruments sold, not yet purchased, at fair value | 15 | 4
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 3 | 3
Total Financial Assets at Fair Value | 3 | 3
Level 3 | Corporate And Municipal 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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