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Income Taxes (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], 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 (79.00%) (75.00%) (58.00%) (66.00%)
State income tax, net of federal income tax benefit (5.00%) (8.00%) 1.00% (3.00%)
Effects of ratemaking (10.00%) (20.00%) (5.00%) (4.00%)
Other, net 1.00% (1.00%) (1.00%) 1.00%
Effective income tax rate (58.00%) (69.00%) (28.00%) (37.00%)
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     $ 87 $ (86)