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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Operating revenues        
Sales of Electricity $ 2,924 $ 2,848 $ 5,887 $ 5,386
Other revenue 35 36 87 81
Revenues 2,959 2,884 5,974 5,467
Operating expenses        
Fuel 700 558 1,315 1,024
Purchased power 393 374 884 743
Operating and maintenance 823 767 1,650 1,547
Depreciation and amortization 550 512 1,083 1,022
Tax equivalents 147 138 298 271
Total operating expenses 2,613 2,349 5,230 4,607
Operating income 346 535 744 860
Other income (expense), net 21 3 37 17
Defined Benefit Plan, Other Cost (Credit) 51 65 102 130
Interest expense        
Interest expense 268 264 530 527
Net income (loss) $ 48 $ 209 $ 149 $ 220