CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Operating revenues
Revenue from sales of electricity	$ 10,586	$ 10,461	$ 10,847
Other revenue	153	155	156
Total operating revenues	10,739	10,616	11,003
Operating expenses
Fuel	2,169	2,126	2,444
Purchased power	991	964	950
Operating and maintenance	3,362	2,842	2,838
Depreciation and amortization	1,717	1,836	2,031
Tax equivalents	525	522	525
Total operating expenses	8,764	8,290	8,788
Operating income	1,975	2,326	2,215
Other income (expense), net	56	43	29
Interest expense
Interest expense	1,346	1,371	1,347
Allowance for funds used during construction	0	(235)	(214)
Net interest expense	1,346	1,136	1,133
Net income (loss)	$ 685	$ 1,233	$ 1,111