Recent Financing Transactions (MEC) Recent Financing Transactions (Details) (MidAmerican Energy Company [Member], Line of Credit [Member], USD $)		1 Months Ended		6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013 Unsecured credit facility, $530 million, expiring July 2013 [Member]	Jun. 30, 2013 Unsecured credit facility, $530 million, expiring July 2013 [Member]	Jun. 30, 2013 Unsecured credit facility, $600 million, expiring March 2018 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 530,000,000	$ 600,000,000
Line of Credit Facility, Expiration Date		Jul. 31, 2013		Mar. 31, 2018
Line of Credit Facility, Amount Outstanding				$ 0
Debt to capitalization ratio	0.65