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Income Taxes (MEC) (Tables) (MidAmerican Energy Company [Member])
 9 Months Ended
Sep. 30, 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 MidAmerican Energy's effective income tax rate applicable to income before income tax benefit is as follows:
 
Three-Month Periods
 
Nine-Month Periods
 
Ended September 30,
 
Ended September 30,
 
2013
 
2012
 
2013
 
2012
 
 
 
 
 
 
 
 
Federal statutory income tax rate
35
 %
 
35
 %
 
35
 %
 
35
 %
Income tax credits
(71
)
 
(52
)
 
(66
)
 
(52
)
State income tax, net of federal income tax benefit
(2
)
 
(2
)
 
(2
)
 
(5
)
Income tax method change
—

 
—

 
—

 
(7
)
Effects of ratemaking
(5
)
 
—

 
(5
)
 
(1
)
Other, net
1

 
(3
)
 
1

 
(1
)
Effective income tax rate
(42
)%
 
(22
)%
 
(37
)%
 
(31
)%