Income Taxes (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%
Income tax credits	(55.00%)	(65.00%)
State income tax, net of federal income tax benefit	2.00%	(2.00%)
Effects of ratemaking	(5.00%)	(2.00%)
Other, net	(1.00%)	2.00%
Effective income tax rate	(24.00%)	(32.00%)
Production Tax Credit Carryforwards [Abstract]
Years eligible for renewable energy production tax credit	10 years
Berkshire Hathaway Energy [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Related Party Transaction, Cash (Paid) Received for Income Taxes, Net	$ 0	$ (160)