INCOME TAXES, Effective Income Tax Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Effective income tax rate reconciliation, amount:
Provision calculated at statutory rate	$ 555	$ 479	$ 425
State income tax, net of federal benefit	87	83	65
Nondeductible executive compensation	13	13	9
Foreign tax rate differential	10	8	4
(Gains)/losses on company-owned life insurance policies which are not subject to tax	(51)	(22)	36
Federal tax credits	(25)	(15)	(17)
Excess tax benefits related to share-based compensation	(20)	(21)	(22)
Nondeductible fines and penalties	(6)	18	0
Other, net	12	(2)	13
Total	$ 575	$ 541	$ 513
Effective income tax rate reconciliation, percent:
Provision calculated at statutory rate	21.00%	21.00%	21.00%
State income tax, net of federal benefit	3.30%	3.60%	3.20%
Nondeductible executive compensation	0.50%	0.60%	0.40%
Foreign tax rate differential	0.40%	0.40%	0.20%
(Gains)/losses on company-owned life insurance policies which are not subject to tax	(1.90%)	(1.00%)	1.80%
Federal tax credits	(1.00%)	(0.70%)	(0.80%)
Excess tax benefits related to share-based compensation	(0.80%)	(0.90%)	(1.10%)
Nondeductible fines and penalties	(0.20%)	0.80%	0.00%
Other, net	0.50%	(0.10%)	0.70%
Total	21.80%	23.70%	25.40%
Investment tax credits	$ 20	$ 11	$ 15
Effective Income Tax Rate Reconciliation [Line Items]
Excess tax benefits related to share-based compensation	20	21	22
Restricted Stock Units | 2012 Stock Incentive Plan
Effective income tax rate reconciliation, amount:
Excess tax benefits related to share-based compensation	(91)	(95)	(101)
Effective Income Tax Rate Reconciliation [Line Items]
Excess tax benefits related to share-based compensation	$ 91	$ 95	$ 101