Related Party Transactions (MEC) (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Affiliated Entity [Member]
Related Party Transactions [Line Items]
Related Party Transaction, Expense Reimbursement	$ 38	$ 51	$ 48
Due from Affiliate, Current	8	5
Due to Affiliate, Current	14	7
Due from affiliates, noncurrent, employee benefit plans	5	16
Due to affiliates, noncurrent, employee benefit plans	31	20
MEHC [Member]
Related Party Transactions [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	10	7	11
Income Taxes Receivable From (Payable To) Related Parties Current	50	(114)
Related Party Transaction, Cash Received for Income Taxes, Net	36	692	221
Northern Natural Gas and BNSF Railway Company [Member]
Related Party Transactions [Line Items]
Related Party Transaction, Purchases from Related Party	155
Northern Natural Gas [Member]
Related Party Transactions [Line Items]
Related Party Transaction, Purchases from Related Party		$ 59	$ 59