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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