Summary of Significant Accounting Policies (MEC) Income Taxes (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Notes to Financial Statements [Line Items]
Regulatory Assets, Noncurrent	$ 748		$ 876
Deferred Income Tax Charges [Member]
Notes to Financial Statements [Line Items]
Regulatory Assets, Noncurrent	$ 649	[1]	$ 640	[1]

[1] Amounts primarily represent income tax benefits related to state accelerated tax depreciation and certain property-related basis differences that were previously flowed through to customers and will be included in regulated rates when the temporary differences reverse.