Summary of Significant Accounting Policies (MEC) Revenue Recognition (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Energy Company [Member]
Notes to Financial Statements [Line Items]
Unbilled revenue receivable	$ 145	$ 135
Adjustment clauses and bill rider accounts receivable	$ 49	$ 54

Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

No definition available.

Name:	us-gaap_UnbilledReceivablesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant