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Related-Party Transactions (Details) (MidAmerican Funding [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Related Party Transaction [Line Items]
Coal transportation services costs, railroad	$ 38	$ 89
BNSF Railway Company [Member]
Related Party Transaction [Line Items]
Due to afilliate, current	$ 5	$ 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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