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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes $ 4,729 $ 4,750
Total financial instruments owned, at fair value 673 630
Other assets - other investments at fair value 215 80
Total financial assets at fair value 5,617 5,460
Financial instruments sold, not yet purchased, at fair value 182 153
Accounts payable, accrued expenses and other liabilities 166  
Total Financial Liabilities at Fair Value 348 153
Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 548 559
Financial instruments sold, not yet purchased, at fair value 144 120
Options Owned [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 22 28
Financial instruments sold, not yet purchased, at fair value 22 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 54 33
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
Precious Metals [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 10  
Financial instruments sold, not yet purchased, at fair value 6  
Currency Forward Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 39 9
Financial instruments sold, not yet purchased, at fair value 10 7
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 4,729 4,750
Total financial instruments owned, at fair value 624 619
Other assets - other investments at fair value 215 80
Total financial assets at fair value 5,568 5,449
Financial instruments sold, not yet purchased, at fair value 166 146
Accounts payable, accrued expenses and other liabilities 166  
Total Financial Liabilities at Fair Value 332 146
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 548 558
Financial instruments sold, not yet purchased, at fair value 144 120
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 22 28
Financial instruments sold, not yet purchased, at fair value 22 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 54 33
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 49 9
Total financial assets at fair value 49 9
Financial instruments sold, not yet purchased, at fair value 16 7
Total Financial Liabilities at Fair Value 16 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 10  
Financial instruments sold, not yet purchased, at fair value 6  
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 39 9
Financial instruments sold, not yet purchased, at fair value $ 10 7
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value   2
Total financial assets at fair value   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 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