Short-term Debt and Revolving Credit Facilities (MEC) (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified				12 Months Ended	1 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Line of Credit [Member]	Dec. 31, 2013 Commercial Paper [Member]	Mar. 31, 2013 Unsecured credit facility, $530 million, expiring July 2013 [Member] Line of Credit [Member]	Mar. 31, 2013 Unsecured credit facility, $600 million, expiring March 2018 [Member] Line of Credit [Member]	Dec. 31, 2013 Unsecured 364-day Credit Facility, $5 million, expiring June 2014 [Member] Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced					$ 530
Line of Credit Facility, Maximum Borrowing Capacity	605	535				600	5
Line of Credit Facility, Expiration Date				Oct. 30, 2014	Jul. 06, 2013	Mar. 27, 2018	Jun. 30, 2014
Required debt to capitalization ratio			0.65
Regulatory Approval for Additional Short-Term Debt Issuances				600
Letters of Credit Outstanding, Amount	(195)	(195)
Line of Credit Facility, Remaining Borrowing Capacity	$ 410	$ 340