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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Operating expenses    
Fuel $ 505 $ 496
Purchased power 394 359
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses 905 867
Depreciation and amortization 557 521
Tax equivalents 146 133
Operating Expenses 2,507 2,376
Operating income 413 389
Other income (expense), net 17 23
Defined Benefit Plan, Other Cost (Credit) 25 23
Interest expense    
Interest expense 280 262
Net income (loss) 125 127
Regulated Operating Revenue 2,876 2,731
Unregulated Operating Revenue 44 34
Regulated and Unregulated Operating Revenue $ 2,920 $ 2,765