Consolidated Statements of Operations (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Operating revenue:
Energy	$ 2,484	$ 2,319	$ 5,270	$ 4,957
Real estate	504	389	785	598
Total operating revenue	2,988	2,708	6,055	5,555
Energy:
Cost of sales	840	750	1,804	1,692
Operating expense	683	674	1,351	1,300
Depreciation and amortization	381	357	765	705
Real estate	443	359	721	574
Total operating costs and expenses	2,347	2,140	4,641	4,271
Operating income	641	568	1,414	1,284
Other income (expense):
Interest expense	(294)	(296)	(584)	(586)
Capitalized interest	19	13	40	22
Allowance for equity funds	19	18	38	35
Other, net	24	2	40	21
Total other income (expense)	(232)	(263)	(466)	(508)
Income before income tax expense and equity income	409	305	948	776
Income tax expense	114	37	223	141
Equity income	26	19	40	31
Net income	321	287	765	666
Net income attributable to noncontrolling interests	10	5	16	9
Net income attributable to MEHC shareholders	$ 311	$ 282	$ 749	$ 657