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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes $ 4,975 $ 3,797
Total financial instruments owned, at fair value 889 1,916
Other assets - other investments at fair value 42 36
Total financial assets at fair value 5,906 5,749
Financial instruments sold, not yet purchased, at fair value 234 457
Total Financial Liabilities at Fair Value 234 457
Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 296 540
Financial instruments sold, not yet purchased, at fair value 135 183
Options owned [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 550 1,333
Financial instruments sold, not yet purchased, at fair value 93 273
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 37 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 3 6
Financial instruments sold, not yet purchased, at fair value 6 1
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 4,975 3,797
Total financial instruments owned, at fair value 882 1,907
Other assets - other investments at fair value 42 36
Total financial assets at fair value 5,899 5,740
Financial instruments sold, not yet purchased, at fair value 228 456
Total Financial Liabilities at Fair Value 228 456
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 295 540
Financial instruments sold, not yet purchased, at fair value 135 183
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 550 1,333
Financial instruments sold, not yet purchased, at fair value 93 273
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 37 34
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 3 6
Total financial assets at fair value 3 6
Financial instruments sold, not yet purchased, at fair value 6 1
Total Financial Liabilities at Fair Value 6 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 3 6
Financial instruments sold, not yet purchased, at fair value 6 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