Consolidated Statements of Operations (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating revenue:
Energy	$ 2,786	$ 2,638
Real estate	281	209
Total operating revenue	3,067	2,847
Energy:
Cost of sales	964	942
Operating expense	668	626
Depreciation and amortization	384	348
Real estate	278	215
Total operating costs and expenses	2,294	2,131
Operating income	773	716
Other income (expense):
Interest expense	(290)	(290)
Capitalized interest	21	9
Allowance for equity funds	19	17
Other, net	16	19
Total other income (expense)	(234)	(245)
Income before income tax expense and equity income	539	471
Income tax expense	109	104
Equity income	14	12
Net income	444	379
Net income attributable to noncontrolling interests	6	4
Net income attributable to MEHC shareholders	$ 438	$ 375