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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Operating revenues    
Sales of Electricity $ 2,538 $ 2,270
Other revenue 45 34
Revenues 2,583 2,304
Operating expenses    
Fuel 466 369
Purchased power 369 206
Operating and maintenance 780 715
Depreciation and amortization 510 378
Tax equivalents 133 121
Total operating expenses 2,258 1,789
Operating income 325 515
Other income (expense), net 14 15
Defined Benefit Plan, Other Cost (Credit) 65 65
Interest expense    
Interest expense 263 281
Net income (loss) $ 11 $ 184