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Income Taxes (MEC) (Details) (MidAmerican Energy Company [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]    
Federal statutory income tax rate 35.00% 35.00%
Income tax credits (61.00%) (49.00%)
State income tax, net of federal income tax benefit (2.00%) (5.00%)
Effects of ratemaking (2.00%) (2.00%)
Other, net 1.00% 2.00%
Effective income tax rate (29.00%) (19.00%)
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 (160) 0