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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Operating revenues      
Regulated Operating Revenue $ 12,128 $ 11,899 $ 12,371
Unregulated Operating Revenue 186 155 169
Revenue from sales of electricity 12,314 12,054 12,540
Operating expenses      
Fuel 2,169 2,549 2,567
Purchased power 1,581 1,633 1,921
Operating and maintenance 3,641 3,372 2,986
Depreciation and amortization 2,138 2,213 2,054
Tax equivalents 557 593 601
Total operating expenses 10,086 10,360 10,129
Operating income 2,228 1,694 2,411
Other income (expense), net 71 61 7
Defined Benefit Plan, Other Cost (Credit) 98 199 258
Interest expense      
Interest expense 1,066 1,056 1,052
Net income (loss) $ 1,135 $ 500 $ 1,108