Related Party Transactions (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Related Party Transactions [Line Items]
Note payable to affiliate	$ 135	$ 246
Debt indenture maximum debt to capitalization ratio	0.67
Debt indenture minimum interest coverage ratio	2.2
Affiliated Entity [Member]
Related Party Transactions [Line Items]
Related Party Transaction, Expense Reimbursement	28	42	44
Due from Affiliate, Current	7	7
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	46	(117)
Related Party Transaction, Cash Received for Income Taxes, Net	42	698	230
MEHC [Member] | MHC, Inc. [Member] | Line of Credit [Member] | Revolving Credit Arrangement, $300 million [Member]
Related Party Transactions [Line Items]
Line of Credit Arrangement Offered to Affiliate, Maximum Amount Available	300
Note payable to affiliate	135	246
Debt, Weighted Average Interest Rate	0.418%	0.465%
MEHC [Member] | MHC, Inc. [Member] | Line of Credit [Member] | Revolving Credit Arrangement, $100 million [Member]
Related Party Transactions [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100
Notes Receivable, Related Parties, Current	0	0
Debt, Weighted Average Interest Rate	0.00%	0.00%
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