Consolidated Statements of Operations Statement (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating revenue	$ 1,250	$ 1,288
Operating costs and expenses:
Energy costs	476	504
Operations and maintenance	268	273
Depreciation and amortization	189	179
Taxes, other than income taxes	45	42
Total operating costs and expenses	978	998
Operating income	272	290
Other income (expense):
Interest expense	(94)	(94)
Allowance for borrowed funds	6	8
Allowance for equity funds	10	16
Other, net	3	2
Total other income (expense)	(75)	(68)
Income before income tax expense	197	222
Income tax expense	63	67
Net income	$ 134	$ 155