Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 286	$ 470
Trade receivables, net	1,270	1,225
Income taxes receivable	456	396
Inventories	690	585
Derivative contracts	38	131
Investments and restricted cash and investments	51	44
Other current assets	492	501
Total current assets	3,283	3,352
Property, plant and equipment, net	34,167	31,899
Goodwill	4,996	5,025
Investments and restricted cash and investments	1,948	2,469
Regulatory assets	2,835	2,433
Derivative contracts	9	13
Other assets	480	477
Total assets	47,718	45,668
Current liabilities:
Accounts payable	989	827
Accrued employee expenses	155	159
Accrued interest	326	341
Accrued property, income and other taxes	340	287
Derivative contracts	160	158
Short-term debt	865	320
Current portion of long-term debt	1,198	1,286
Other current liabilities	514	450
Total current liabilities	4,547	3,828
Regulatory liabilities	1,663	1,638
Derivative contracts	176	458
MEHC senior debt	4,621	5,371
MEHC subordinated debt	0	172
Subsidiary debt	13,253	12,662
Deferred income taxes	7,076	6,298
Other long-term liabilities	2,117	1,833
Total liabilities	33,453	32,260
MEHC shareholders' equity:
Common stock - 115 shares authorized, no par value, 75 shares issued and outstanding	0	0
Additional paid-in capital	5,423	5,427
Retained earnings	9,310	7,979
Accumulated other comprehensive loss, net	(641)	(174)
Total MEHC shareholders' equity	14,092	13,232
Noncontrolling interests	173	176
Total equity	14,265	13,408
Total liabilities and equity	$ 47,718	$ 45,668