Consolidated Statements of Operations Statement (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Operating revenue	$ 1,153	$ 1,091	$ 2,344	$ 2,210
Operating costs and expenses:
Energy costs	404	371	849	754
Operations and maintenance	300	270	569	548
Depreciation and amortization	160	152	317	305
Taxes, other than income taxes	38	35	80	73
Total operating costs and expenses	902	828	1,815	1,680
Operating income	251	263	529	530
Other income (expense):
Interest expense	(95)	(99)	(190)	(195)
Allowance for borrowed funds	8	5	15	11
Allowance for equity funds	15	11	30	22
Interest income	0	3	1	4
Other, net	(1)	(1)	1	(1)
Total other income (expense)	(73)	(81)	(143)	(159)
Income before income tax expense	178	182	386	371
Income tax expense	48	53	105	115
Net income	$ 130	$ 129	$ 281	$ 256