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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