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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes $ 7,363 $ 4,729
Total financial instruments owned, at fair value 551 673
Other assets 231 215
Total financial assets at fair value 8,145 5,617
Financial instruments sold, not yet purchased, at fair value 218 182
Accounts payable, accrued expenses and other liabilities 184 166
Total Financial Liabilities at Fair Value 402 348
US And Foreign Government Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 7,348 4,729
Total financial instruments owned, at fair value 156 54
Municipal Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 15  
Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 354 548
Financial instruments sold, not yet purchased, at fair value 159 144
Options Owned [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 31 22
Financial instruments sold, not yet purchased, at fair value 25 22
Customer-Held Fractional Shares [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 112 166
Crypto-Asses Safeguarding Asset [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 72  
Other Investments In Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 47 49
Fractional Shares Repurchase Obligation [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Accounts payable, accrued expenses and other liabilities 112 166
Crypto-Assets Safeguarding Liability [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Accounts payable, accrued expenses and other liabilities 72  
Precious Metals [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 9 10
Financial instruments sold, not yet purchased, at fair value 7 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 27 10
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 7,348 4,729
Total financial instruments owned, at fair value 541 624
Other assets 159 215
Total financial assets at fair value 8,048 5,568
Financial instruments sold, not yet purchased, at fair value 184 166
Accounts payable, accrued expenses and other liabilities 112 166
Total Financial Liabilities at Fair Value 296 332
Level 1 [Member] | US And Foreign Government Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 7,348 4,729
Total financial instruments owned, at fair value 156 54
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 354 548
Financial instruments sold, not yet purchased, at fair value 159 144
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 31 22
Financial instruments sold, not yet purchased, at fair value 25 22
Level 1 [Member] | Customer-Held Fractional Shares [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 112 166
Level 1 [Member] | Other Investments In Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 47 49
Level 1 [Member] | Fractional Shares Repurchase Obligation [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Accounts payable, accrued expenses and other liabilities 112 166
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 15  
Total financial instruments owned, at fair value 10 49
Other assets 72  
Total financial assets at fair value 97 49
Financial instruments sold, not yet purchased, at fair value 34 16
Accounts payable, accrued expenses and other liabilities 72  
Total Financial Liabilities at Fair Value 106 16
Level 2 [Member] | Municipal Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 15  
Level 2 [Member] | Crypto-Asses Safeguarding Asset [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 72  
Level 2 [Member] | Crypto-Assets Safeguarding Liability [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Accounts payable, accrued expenses and other liabilities 72  
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 9 10
Financial instruments sold, not yet purchased, at fair value 7 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 $ 27 $ 10