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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Operating revenues      
Electric revenue $ 11,075 $ 10,586 $ 10,461
Other revenue 158 153 155
Revenue from sales of electricity 11,233 10,739 10,616
Operating expenses      
Fuel 2,049 2,169 2,126
Purchased power 973 991 964
Operating and maintenance 2,854 3,362 2,842
Depreciation and amortization 2,527 1,717 1,836
Tax equivalents 518 525 522
Total operating expenses 8,921 8,764 8,290
Operating income 2,312 1,975 2,326
Other income (expense), net 50 56 43
Interest expense      
Interest expense 1,243 1,346 1,371
Allowance for funds used during construction 0 0 (235)
Net interest expense 1,243 1,346 1,136
Net income (loss) $ 1,119 $ 685 $ 1,233