Consolidated Statements of Operations (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating revenue:
Regulated electric	$ 196	$ 177
Regulated natural gas	50	44
Total operating revenue	246	221
Operating costs and expenses:
Cost of fuel, energy and capacity	97	80
Cost of Natural Gas Purchases	35	29
Operating and maintenance expense	36	34
Depreciation and amortization	28	26
Property and other taxes	7	6
Total operating costs and expenses	203	175
Operating income	43	46
Other income (expense):
Interest expense, net of allowance for debt funds	(15)	(15)
Allowance for equity funds	1	1
Other, net	1	2
Total other income (expense)	(13)	(12)
Income before income tax expense	30	34
Income Tax Expense (Benefit)	11	12
Net income	$ 19	$ 22