Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Operating revenue	$ 1,269	$ 1,243	$ 2,519	$ 2,531
Operating costs and expenses:
Energy costs	437	444	913	948
Operations and maintenance	272	241	540	514
Depreciation and amortization	190	177	379	356
Taxes, other than income taxes	45	40	90	82
Total operating costs and expenses	944	902	1,922	1,900
Operating income	325	341	597	631
Other income (expense):
Interest expense	(94)	(97)	(188)	(191)
Allowance for borrowed funds	4	7	10	15
Allowance for equity funds	9	14	19	30
Other, net	2	3	5	5
Total other income (expense)	(79)	(73)	(154)	(141)
Income before income tax expense	246	268	443	490
Income tax expense	75	84	138	151
Net income	$ 171	$ 184	$ 305	$ 339