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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
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 (75.00%) (60.00%) (66.00%) (57.00%)
State income tax, net of federal income tax benefit (8.00%) (13.00%) (3.00%) (9.00%)
Income tax method change 0.00% (36.00%) 0.00% (16.00%)
Effects of ratemaking (20.00%) (4.00%) (4.00%) (3.00%)
Other, net (1.00%) 5.00% 1.00% 2.00%
Effective income tax rate (69.00%) (73.00%) (37.00%) (48.00%)
Production Tax Credit Carryforwards [Abstract]        
Years eligible for renewable energy production tax credit     10 years  
MEHC [Member]
       
Related Party Income Tax Receivable (Payable) [Abstract]        
Related Party Transaction, Cash (Paid) Received for Income Taxes, Net     $ (86) $ 498
Repairs Deduction [Member]
       
Income tax method change [Abstract]        
Income tax method change benefit     $ 16