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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Operating revenues        
Sales of Electricity $ 2,664 $ 2,932 $ 8,551 $ 8,318
Other revenue 34 38 121 119
Revenues 2,698 2,970 8,672 8,437
Operating expenses        
Fuel 530 539 1,845 1,563
Purchased power 350 465 1,234 1,208
Operating and maintenance 896 722 2,546 2,269
Depreciation and amortization 548 513 1,631 1,535
Tax equivalents 137 141 435 412
Total operating expenses 2,461 2,380 7,691 6,987
Operating income 237 590 981 1,450
Other income (expense), net 20 (6) 57 11
Defined Benefit Plan, Other Cost (Credit) 51 64 153 194
Interest expense        
Interest expense 264 264 794 791
Net income (loss) $ (58) $ 256 $ 91 $ 476