Consolidated Balance Sheets (MEC) (MidAmerican Energy Company and Subsidiaries [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
MidAmerican Energy Company and Subsidiaries [Member]
Utility plant, net:
Electric	$ 11,416	$ 10,587
Gas	1,301	1,255
Gross utility plant in service	12,717	11,842
Accumulated depreciation and amortization	(4,413)	(4,120)
Utility plant in service, net	8,304	7,722
Construction work in progress	318	173
Total utility plant, net	8,622	7,895
Current assets:
Cash and cash equivalents	354	1	203
Receivables, net	416	373
Income tax receivables	0	272
Inventories	240	201
Other	56	57
Total current assets	1,066	904
Other assets:
Regulatory assets	876	831
Investments and nonregulated property, net	535	503
Other	133	177
Total other assets	1,544	1,511
Total assets	11,232	10,310	9,010
Capitalization:
MidAmerican Energy common shareholder's equity	3,608	3,244
Preferred securities	27	27
Noncontrolling interests	0	1
Long-term debt, excluding current portion	2,590	3,115
Total capitalization	6,225	6,387
Current liabilities:
Current portion of long-term debt	669	0
Accounts payable	386	313
Taxes accrued	224	107
Interest accrued	27	34
Other	120	119
Total current liabilities	1,426	573
Other liabilities:
Deferred income taxes	2,164	1,918
Asset retirement obligations	318	293
Regulatory liabilities	750	719
Other	349	420
Total other liabilities	3,581	3,350
Total capitalization and liabilities	$ 11,232	$ 10,310