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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Operating revenues    
Sales of Electricity $ 2,963 $ 2,538
Other revenue 52 45
Revenues 3,015 2,583
Operating expenses    
Fuel 615 466
Purchased power 491 369
Operating and maintenance 827 780
Depreciation and amortization 533 510
Tax equivalents 151 133
Total operating expenses 2,617 2,258
Operating income 398 325
Other income (expense), net 16 14
Defined Benefit Plan, Other Cost (Credit) 51 65
Interest expense    
Interest expense 262 263
Net income (loss) $ 101 $ 11