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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Operating revenues        
Sales of Electricity $ 2,533 $ 2,489 $ 4,803 $ 5,021
Other revenue 39 32 73 78
Revenues 2,572 2,521 4,876 5,099
Operating expenses        
Fuel 413 429 782 852
Purchased power 225 252 431 471
Operating and maintenance 644 644 1,359 1,333
Depreciation and amortization 381 457 759 1,041
Tax equivalents 124 132 245 263
Total operating expenses 1,787 1,914 3,576 3,960
Operating income 785 607 1,300 1,139
Other income (expense), net 11 (1) 26 11
Defined Benefit Plan, Other Cost (Credit) 64 62 129 127
Interest expense        
Interest expense 276 289 557 576
Net income (loss) $ 456 $ 255 $ 640 $ 447