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:
Regulated electric	$ 228	$ 233	$ 625	$ 589
Regulated natural gas	18	18	94	83
Total operating revenue	246	251	719	672
Operating costs and expenses:
Cost of fuel, energy and capacity	96	103	294	269
Natural gas purchased for resale	7	7	57	48
Operating and maintenance	41	47	116	120
Depreciation and amortization	28	27	84	79
Property and other taxes	8	7	22	19
Total operating costs and expenses	180	191	573	535
Operating income	66	60	146	137
Other income (expense):
Interest expense	(16)	(16)	(46)	(46)
Allowance for borrowed funds	0	1	1	2
Allowance for equity funds	1	1	2	3
Other, net	1	3	3	8
Total other income (expense)	(14)	(11)	(40)	(33)
Income before income tax expense	52	49	106	104
Income tax expense	19	18	38	37
Net income	$ 33	$ 31	$ 68	$ 67