EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income for basic earnings per common share:
Net income available to common shareholders	$ 369	$ 299	$ 1,301	$ 1,068
Less allocation of earnings and dividends to participating securities	(1)	(1)	(4)	(2)
Net income available to common shareholders after participating securities	368	298	1,297	1,066
Income for diluted earnings per common share:
Net income available to common shareholders	369	299	1,301	1,068
Less allocation of earnings and dividends to participating securities	(1)	(1)	(4)	(2)
Net income available to common shareholders after participating securities	$ 368	$ 298	$ 1,297	$ 1,066
Common shares:
Average common shares in basic computation (in shares)	210.1	210.7	213.0	208.1
Dilutive effect of outstanding stock options and certain restricted stock units (in shares)	4.7	5.0	5.0	5.4
Average common and common equivalent shares used in diluted computation (in shares)	214.8	215.7	218.0	213.5
Earnings per common share:
Basic (in dollars per share)	$ 1.75	$ 1.41	$ 6.09	$ 5.12
Diluted (in dollars per share)	$ 1.71	$ 1.38	$ 5.95	$ 4.99
Stock options and certain RSUs excluded from weighted-average diluted common shares because their effect would be antidilutive (in shares)	1.8	0.5	1.4	0.4