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Financial Assets And Financial Liabilities (Financial Assets and Liabilities Not Measured at Fair Value) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Cash and cash equivalents $ 5,128 $ 3,633 $ 3,595
Cash segregated for regulatory purposes 48,784 36,600 $ 35,216
Securities - segregated for regulatory purposes 38,691 27,846  
Securities borrowed 11,568 5,369  
Securities purchased under agreements to resell 8,524 6,575  
Receivables from customers 77,588 64,432  
Brokers, dealers and clearing organizations 4,773 2,196  
Interest Receivable 488 446  
Other assets 1,551 1,121  
Short-term borrowings 10 14  
Securities loaned 27,031 16,248  
Securities sold under agreements to repurchase 894    
Customers 149,442 115,343  
Brokers, dealers and clearing organizations 1,541 476  
Interest 317 311  
at Fair Value      
Cash and cash equivalents 5,128 3,633  
Cash segregated for regulatory purposes 48,784 36,600  
Securities - segregated for regulatory purposes 32,509 21,353  
Securities borrowed 11,568 5,369  
Securities purchased under agreements to resell 8,524 6,575  
Receivables from customers 77,588 64,432  
Brokers, dealers and clearing organizations 4,773 2,196  
Interest Receivable 488 446  
Other assets 42 32  
Total financial assets, not measured at fair value 189,404 140,636  
Short-term borrowings 10 14  
Securities loaned 27,031 16,248  
Securities sold under agreements to repurchase 894    
Customers 149,442 115,343  
Brokers, dealers and clearing organizations 1,541 476  
Interest 317 311  
Total financial liabilities, not measured at fair value 179,235 132,392  
Carrying Value      
Cash and cash equivalents 5,128 3,633  
Cash segregated for regulatory purposes 48,784 36,600  
Securities - segregated for regulatory purposes 32,509 21,353  
Securities borrowed 11,568 5,369  
Securities purchased under agreements to resell 8,524 6,575  
Receivables from customers 77,588 64,432  
Brokers, dealers and clearing organizations 4,773 2,196  
Interest Receivable 488 446  
Other assets 41 30  
Total financial assets, not measured at fair value 189,403 140,634  
Short-term borrowings 10 14  
Securities loaned 27,031 16,248  
Securities sold under agreements to repurchase 894    
Customers 149,442 115,343  
Brokers, dealers and clearing organizations 1,541 476  
Interest 317 311  
Total financial liabilities, not measured at fair value 179,235 132,392  
Level 1 [Member]      
Cash and cash equivalents 5,128 3,633  
Cash segregated for regulatory purposes 48,784 36,600  
Total financial assets, not measured at fair value 53,912 40,233  
Short-term borrowings  
Securities loaned  
Securities sold under agreements to repurchase    
Customers  
Brokers, dealers and clearing organizations  
Interest  
Total financial liabilities, not measured at fair value  
Level 2 [Member]      
Securities - segregated for regulatory purposes 32,509 21,353  
Securities borrowed 11,568 5,369  
Securities purchased under agreements to resell 8,524 6,575  
Receivables from customers 77,588 64,432  
Brokers, dealers and clearing organizations 4,773 2,196  
Interest Receivable 488 446  
Other assets 3 3  
Total financial assets, not measured at fair value 135,453 100,374  
Short-term borrowings 10 14  
Securities loaned 27,031 16,248  
Securities sold under agreements to repurchase 894    
Customers 149,442 115,343  
Brokers, dealers and clearing organizations 1,541 476  
Interest 317 311  
Total financial liabilities, not measured at fair value 179,235 132,392  
Level 3 [Member]      
Cash and cash equivalents  
Cash segregated for regulatory purposes  
Securities - segregated for regulatory purposes  
Securities borrowed  
Securities purchased under agreements to resell  
Receivables from customers  
Brokers, dealers and clearing organizations  
Interest Receivable  
Other assets 39 29  
Total financial assets, not measured at fair value 39 29  
Short-term borrowings  
Securities loaned  
Securities sold under agreements to repurchase    
Customers  
Brokers, dealers and clearing organizations  
Interest  
Total financial liabilities, not measured at fair value