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Income Taxes (LLC) (Details) - MidAmerican Funding, LLC and Subsidiaries [Domain] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
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 (70.00%) (79.00%) (60.00%) (58.00%)
State income tax, net of federal income tax benefit (9.00%) (5.00%) (3.00%) 1.00%
Income tax method change (0.00%) (0.00%) (0.00%) (0.00%)
Effects of ratemaking (13.00%) (10.00%) (11.00%) (5.00%)
Other, net (0.00%) 1.00% (1.00%) (1.00%)
Effective income tax rate (57.00%) (58.00%) (40.00%) (28.00%)
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     $ 374 $ 87