v3.26.1
VARIABLE INTEREST ENTITIES, Primary Beneficiary - Carrying Value of Assets, Liabilities and Equity (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Assets:        
Cash and cash equivalents and assets segregated for regulatory purposes and restricted cash $ 14,964 $ 14,787 $ 13,087 $ 14,348
Other assets 3,695 3,515    
Total assets 91,944 88,230    
Liabilities:        
Other payables 1,907 1,961    
Total liabilities 79,334 75,726    
Noncontrolling interests 43 1    
Variable Interest Entity, Primary Beneficiary        
Assets:        
Total assets 112 93    
Liabilities:        
Total liabilities 51 39    
Variable Interest Entity, Primary Beneficiary | Carrying amount        
Assets:        
Cash and cash equivalents and assets segregated for regulatory purposes and restricted cash 23 19    
Other assets 58 55    
Total assets 81 74    
Liabilities:        
Other payables 13 13    
Total liabilities 13 13    
Noncontrolling interests $ 4 $ 1