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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes $ 3,925 $ 4,750
Total financial instruments owned, at fair value 659 630
Other assets - other investments at fair value 106 80
Total financial assets at fair value 4,690 5,460
Financial instruments sold, not yet purchased, at fair value 233 153
Total Financial Liabilities at Fair Value 233 153
Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 582 559
Financial instruments sold, not yet purchased, at fair value 149 120
Options Owned [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 31 28
Financial instruments sold, not yet purchased, at fair value 32 26
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 33 33
Corporate Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 1 1
Precious Metals [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 11  
Financial instruments sold, not yet purchased, at fair value 5  
Currency Forward Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 1 9
Financial instruments sold, not yet purchased, at fair value 47 7
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 3,925 4,750
Total financial instruments owned, at fair value 646 619
Other assets - other investments at fair value 106 80
Total financial assets at fair value 4,677 5,449
Financial instruments sold, not yet purchased, at fair value 181 146
Total Financial Liabilities at Fair Value 181 146
Level 1 [Member] | Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 582 558
Financial instruments sold, not yet purchased, at fair value 149 120
Level 1 [Member] | Options Owned [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 31 28
Financial instruments sold, not yet purchased, at fair value 32 26
Level 1 [Member] | 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 33 33
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 12 9
Total financial assets at fair value 12 9
Financial instruments sold, not yet purchased, at fair value 52 7
Total Financial Liabilities at Fair Value 52 7
Level 2 [Member] | Precious Metals [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 11  
Financial instruments sold, not yet purchased, at fair value 5  
Level 2 [Member] | Currency Forward Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 1 9
Financial instruments sold, not yet purchased, at fair value 47 7
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 1 2
Total financial assets at fair value 1 2
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 $ 1 $ 1