Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 618	$ 776
Trade receivables, net	1,300	1,380
Income taxes receivable	69	336
Inventories	740	766
Other current assets	564	612
Total current assets	3,291	3,870
Property, plant and equipment, net	37,723	37,614
Goodwill	5,071	5,120
Regulatory assets	2,764	2,840
Investments and restricted cash and investments	2,529	2,392
Other assets	627	631
Total assets	52,005	52,467
Current liabilities:
Accounts payable	984	1,214
Accrued interest	332	330
Accrued property, income and other taxes	316	299
Accrued employee expenses	215	188
Short-term debt	451	887
Current portion of long-term debt	1,350	1,137
Other current liabilities	676	695
Total current liabilities	4,324	4,750
Regulatory liabilities	1,784	1,749
MEHC senior debt	4,371	4,621
Subsidiary debt	14,766	14,977
Deferred income taxes	8,018	7,903
Other long-term liabilities	2,516	2,557
Total liabilities	35,779	36,557
Commitments and contingencies (Note 10)
MEHC shareholders' equity:
Common stock - 115 shares authorized, no par value, 75 shares issued and outstanding	0	0
Additional paid-in capital	5,423	5,423
Retained earnings	11,220	10,782
Accumulated other comprehensive loss, net	(585)	(463)
Total MEHC shareholders' equity	16,058	15,742
Noncontrolling interests	168	168
Total equity	16,226	15,910
Total liabilities and equity	$ 52,005	$ 52,467