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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes $ 5,320 $ 4,729
Total financial instruments owned, at fair value 1,093 673
Other assets 218 215
Total financial assets at fair value 6,631 5,617
Financial instruments sold, not yet purchased, at fair value 411 182
Accounts payable, accrued expenses and other liabilities 185 166
Total Financial Liabilities at Fair Value 596 348
US And Foreign Government Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 5,298 4,729
Total financial instruments owned, at fair value 29 54
Municipal Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 22  
Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 276 548
Financial instruments sold, not yet purchased, at fair value 164 144
Options Owned [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 737 22
Financial instruments sold, not yet purchased, at fair value 232 22
Customer-Held Fractional Shares [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 84 166
Crypto-Asses Safeguarding Asset [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 101  
Other Investments In Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 33 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 84 166
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 101  
Precious Metals [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 8 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 43 39
Financial instruments sold, not yet purchased, at fair value 8 10
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 5,298 4,729
Total financial instruments owned, at fair value 1,042 624
Other assets 117 215
Total financial assets at fair value 6,457 5,568
Financial instruments sold, not yet purchased, at fair value 396 166
Accounts payable, accrued expenses and other liabilities 84 166
Total Financial Liabilities at Fair Value 480 332
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 5,298 4,729
Total financial instruments owned, at fair value 29 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 276 548
Financial instruments sold, not yet purchased, at fair value 164 144
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 737 22
Financial instruments sold, not yet purchased, at fair value 232 22
Level 1 [Member] | Customer-Held Fractional Shares [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 84 166
Level 1 [Member] | Other Investments In Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 33 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 84 166
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 22  
Total financial instruments owned, at fair value 51 49
Other assets 101  
Total financial assets at fair value 174 49
Financial instruments sold, not yet purchased, at fair value 15 16
Accounts payable, accrued expenses and other liabilities 101  
Total Financial Liabilities at Fair Value 116 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 22  
Level 2 [Member] | Crypto-Asses Safeguarding Asset [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 101  
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 101  
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 8 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 43 39
Financial instruments sold, not yet purchased, at fair value $ 8 $ 10