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Income Taxes (MEC) (Tables) (MidAmerican Energy Company [Member])
 3 Months Ended
Mar. 31, 2013
MidAmerican Energy Company [Member]
  
Income Taxes [Line Items]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax benefit is as follows:
 
Three-Month Periods
 
Ended March 31,
 
2013
 
2012
 
 
 
 
Federal statutory income tax rate
35
 %
 
35
 %
Income tax credits
(61
)
 
(49
)
State income tax, net of federal income tax benefit
(2
)
 
(5
)
Effects of ratemaking
(2
)
 
(2
)
Other, net
1

 
2

Effective income tax rate
(29
)%
 
(19
)%