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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Operating revenues        
Sales of Electricity $ 2,848 $ 2,533 $ 5,386 $ 4,803
Other revenue 36 39 81 73
Revenues 2,884 2,572 5,467 4,876
Operating expenses        
Fuel 558 413 1,024 782
Purchased power 374 225 743 431
Operating and maintenance 767 644 1,547 1,359
Depreciation and amortization 512 381 1,022 759
Tax equivalents 138 124 271 245
Total operating expenses 2,349 1,787 4,607 3,576
Operating income 535 785 860 1,300
Other income (expense), net 3 11 17 26
Defined Benefit Plan, Other Cost (Credit) 65 64 130 129
Interest expense        
Interest expense 264 276 527 557
Net income (loss) $ 209 $ 456 $ 220 $ 640