Consolidated Statements of Operations Statement (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating revenue	$ 1,191	$ 1,119
Operating costs and expenses:
Energy costs	445	383
Operations and maintenance	269	278
Depreciation and amortization	157	153
Taxes, other than income taxes	42	38
Total operating costs and expenses	913	852
Operating income	278	267
Other income (expense):
Interest expense	(95)	(96)
Allowance for borrowed funds	7	6
Allowance for equity funds	15	11
Interest income	1	1
Other, net	2	0
Total other income (expense)	(70)	(78)
Income before income tax expense	208	189
Income tax expense	57	62
Net income	$ 151	$ 127