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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes $ 7,416 $ 4,729
Total financial instruments owned, at fair value 577 673
Other assets 215 215
Total financial assets at fair value 8,208 5,617
Financial instruments sold, not yet purchased, at fair value 190 182
Accounts payable, accrued expenses and other liabilities 166 166
Total Financial Liabilities at Fair Value 356 348
Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 477 548
Financial instruments sold, not yet purchased, at fair value 140 144
Options Owned [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 36 22
Financial instruments sold, not yet purchased, at fair value 35 22
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 53 54
Precious Metals [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 10 10
Financial instruments sold, not yet purchased, at fair value 8 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 1 39
Financial instruments sold, not yet purchased, at fair value 7 10
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 7,416 4,729
Total financial instruments owned, at fair value 566 624
Other assets 215 215
Total financial assets at fair value 8,197 5,568
Financial instruments sold, not yet purchased, at fair value 175 166
Accounts payable, accrued expenses and other liabilities 166 166
Total Financial Liabilities at Fair Value 341 332
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 477 548
Financial instruments sold, not yet purchased, at fair value 140 144
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 36 22
Financial instruments sold, not yet purchased, at fair value 35 22
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 53 54
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 11 49
Total financial assets at fair value 11 49
Financial instruments sold, not yet purchased, at fair value 15 16
Total Financial Liabilities at Fair Value 15 16
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 10
Financial instruments sold, not yet purchased, at fair value 8 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 1 39
Financial instruments sold, not yet purchased, at fair value $ 7 $ 10