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Related Party Transactions (MEC) (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Related Party Transaction [Line Items]
Coal transportation services costs, railroad	$ 51
BNSF Railway Company [Member]
Related Party Transaction [Line Items]
Due to Affiliate, Current	$ 5

Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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