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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Operating expenses        
Fuel $ 641 $ 700 $ 1,137 $ 1,315
Purchased power 372 393 731 884
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses 889 823 1,756 1,650
Depreciation and amortization 530 550 1,051 1,083
Tax equivalents 141 147 274 298
Costs and Expenses 2,573 2,613 4,949 5,230
Operating income 581 346 970 744
Other income (expense), net 18 21 41 37
Defined Benefit Plan, Other Cost (Credit) 26 51 49 102
Interest expense        
Interest expense 266 268 528 530
Net income (loss) 307 48 434 149
Regulated Operating Revenue 3,093 2,924 5,824 5,887
Unregulated Operating Revenue 61 35 95 87
Regulated and Unregulated Operating Revenue $ 3,154 $ 2,959 $ 5,919 $ 5,974