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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Operating expenses    
Fuel $ 496 $ 615
Purchased power 359 491
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses 867 827
Depreciation and amortization 521 533
Tax equivalents 133 151
Costs and Expenses 2,376 2,617
Operating income 389 398
Other income (expense), net 23 16
Defined Benefit Plan, Other Cost (Credit) 23 51
Interest expense    
Interest expense 262 262
Net income (loss) 127 101
Regulated Operating Revenue 2,731 2,963
Unregulated Operating Revenue 34 52
Regulated and Unregulated Operating Revenue $ 2,765 $ 3,015