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Income Taxes (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 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 (58.00%) (74.00%) (58.00%) (70.00%)
State income tax, net of federal income tax benefit (3.00%) (2.00%) (1.00%) (3.00%)
Effects of ratemaking (4.00%) (5.00%) (5.00%) (5.00%)
Other, net 0.00% 0.00% 0.00% 1.00%
Effective income tax rate (30.00%) (46.00%) (29.00%) (42.00%)
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     $ 153 $ 22