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INCOME TAXES, Effective Income Tax Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Effective income tax rate reconciliation (as a percent):      
Provision calculated at statutory rate 21.00% 21.00% 21.00%
State income tax, net of federal benefit 3.90% 3.60% 3.60%
Nondeductible fines and penalties 0.80% 0.00% 0.00%
Nondeductible executive compensation 0.60% 0.40% 0.30%
Foreign tax rate differential 0.40% 0.20% 0.20%
General business tax credits (1.00%) (1.20%) (1.00%)
(Gains)/losses on company-owned life insurance policies which are not subject to tax (1.00%) 1.80% (1.80%)
Excess tax benefits related to share-based compensation (0.90%) (1.10%) (0.20%)
Solar and LIHTC investment amortization, net of tax credits received (0.40%) 0.00% 0.00%
Change in uncertain tax positions (0.10%) 0.30% (0.10%)
Other, net 0.40% 0.40% (0.30%)
Total provision for income tax 23.70% 25.40% 21.70%
Amortization of the investment included in income tax expense $ 86    
Investment tax credit 81    
Other tax expense (benefit) (9)    
Amortization of proportional amortization method-eligible LIHTC investments 3    
Tax credits received from LIHTC investments $ 3