Income Taxes (MEC) (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Income tax credits	(62.00%)	(57.00%)	(55.00%)	(60.00%)
State income tax, net of federal income tax benefit	(3.00%)	(4.00%)	1.00%	(2.00%)
Effects of ratemaking	(8.00%)	(15.00%)	(5.00%)	(4.00%)
Other, net	(1.00%)	0.00%	(1.00%)	0.00%
Effective income tax rate	(39.00%)	(41.00%)	(25.00%)	(31.00%)
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			$ 86	$ (89)