Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating revenue	$ 1,423	$ 1,438	$ 3,942	$ 3,969
Operating costs and expenses:
Energy costs	491	525	1,404	1,473
Operations and maintenance	260	267	800	781
Depreciation and amortization	188	185	567	541
Taxes, other than income taxes	48	44	138	126
Total operating costs and expenses	987	1,021	2,909	2,921
Operating income	436	417	1,033	1,048
Other income (expense):
Interest expense	(95)	(94)	(283)	(285)
Allowance for borrowed funds	4	5	14	20
Allowance for equity funds	7	10	26	40
Other, net	2	2	7	7
Total other income (expense)	(82)	(77)	(236)	(218)
Income before income tax expense	354	340	797	830
Income tax expense	109	101	247	252
Net income	$ 245	$ 239	$ 550	$ 578