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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Income for basic earnings per common share:        
Net income available to common shareholders $ 595 $ 435 $ 1,699 $ 1,527
Less allocation of earnings and dividends to participating securities (1) 0 (2) (2)
Net income available to common shareholders after participating securities 594 435 1,697 1,525
Income for diluted earnings per common share:        
Net income available to common shareholders 595 435 1,699 1,527
Less allocation of earnings and dividends to participating securities (1) 0 (2) (2)
Net income available to common shareholders after participating securities $ 594 $ 435 $ 1,697 $ 1,525
Common shares:        
Average common shares in basic computation (in shares) 194.0 201.2 195.7 203.0
Dilutive effect of outstanding stock options and certain RSUs (in shares) 3.2 4.3 3.4 4.6
Average common and common equivalent shares used in diluted computation (in shares) 197.2 205.5 199.1 207.6
Earnings per common share:        
Basic (in usd per share) $ 3.06 $ 2.16 $ 8.67 $ 7.51
Diluted (in usd per share) $ 3.01 $ 2.12 $ 8.52 $ 7.35
Stock options and certain RSUs excluded from weighted-average diluted common shares because their effect would be antidilutive (in shares) 0.1 1.1 0.0 1.1