Summary of Significant Accounting Policies (MEC) (Tables) (MidAmerican Energy Company and Subsidiaries [Member])

12 Months Ended

Dec. 31, 2012

MidAmerican Energy Company and Subsidiaries [Member]

Notes to Consolidated Financial Statements [Line Items]

Schedule of Public Utility Property, Plant, and Equipment [Table Text Block]

The average depreciation and amortization rates applied to depreciable utility plant for the years ended December 31 were as follows:

	2012		2011		2010
Electric	3.3	%	3.2	%	3.4	%
Gas	2.8	%	2.9	%	3.0	%