v3.26.1
SEGMENT INFORMATION, Classified by Major Geographic Areas (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Sep. 30, 2025
Net revenues:          
Total net revenues $ 3,859 $ 3,403 $ 7,594 $ 6,940  
Pre-tax income/(loss):          
Total pre-tax income 735 671 1,463 1,420  
Total assets:          
Total assets 91,944   91,944   $ 88,230
U.S.          
Net revenues:          
Total net revenues 3,528 3,116 6,937 6,338  
Pre-tax income/(loss):          
Total pre-tax income 706 637 1,399 1,329  
Total assets:          
Total assets 85,384   85,384   82,289
Canada          
Net revenues:          
Total net revenues 191 161 376 325  
Pre-tax income/(loss):          
Total pre-tax income 40 35 79 74  
Total assets:          
Total assets 3,492   3,492   3,182
Europe          
Net revenues:          
Total net revenues 140 126 281 277  
Pre-tax income/(loss):          
Total pre-tax income (11) $ (1) (15) $ 17  
Total assets:          
Total assets $ 3,068   $ 3,068   $ 2,759