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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes $ 6,182 $ 6,493
Total financial instruments owned, at fair value 3,127 1,924
Other assets 484 292
Total financial assets at fair value 9,793 8,709
Financial instruments sold, not yet purchased, at fair value 499 293
Accounts payable, accrued expenses and other liabilities 394 260
Total Financial Liabilities at Fair Value 893 553
US And Foreign Government Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 6,096 6,460
Municipal Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 86 33
Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 2,966 1,763
Financial instruments sold, not yet purchased, at fair value 194 116
Options Owned [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 72 84
Financial instruments sold, not yet purchased, at fair value 262 96
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 41 54
Customer-Held Fractional Shares [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 394 260
Other Investments In Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 90 32
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 394 260
Mutual Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value   2
Precious Metals [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 41 21
Financial instruments sold, not yet purchased, at fair value 36 18
Currency Forward Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 7  
Financial instruments sold, not yet purchased, at fair value 7 63
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 6,096 6,460
Total financial instruments owned, at fair value 3,056 1,903
Other assets 484 292
Total financial assets at fair value 9,636 8,655
Financial instruments sold, not yet purchased, at fair value 227 212
Accounts payable, accrued expenses and other liabilities 394 260
Total Financial Liabilities at Fair Value 621 472
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 6,096 6,460
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 2,966 1,763
Financial instruments sold, not yet purchased, at fair value 194 116
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 49 84
Financial instruments sold, not yet purchased, at fair value 33 96
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 41 54
Level 1 [Member] | Customer-Held Fractional Shares [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 394 260
Level 1 [Member] | Other Investments In Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 90 32
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 394 260
Level 1 [Member] | Mutual Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value   2
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 86 33
Total financial instruments owned, at fair value 71 21
Total financial assets at fair value 157 54
Financial instruments sold, not yet purchased, at fair value 272 81
Total Financial Liabilities at Fair Value 272 81
Level 2 [Member] | Municipal Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 86 33
Level 2 [Member] | Options Owned [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 23  
Financial instruments sold, not yet purchased, at fair value 229  
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 41 21
Financial instruments sold, not yet purchased, at fair value 36 18
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 7  
Financial instruments sold, not yet purchased, at fair value $ 7 $ 63