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Income Taxes (MEC) (Tables)
 6 Months Ended
Jun. 30, 2015
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
 
Six-Month Periods
 
Ended June 30,
 
Ended June 30,
 
2015
 
2014
 
2015
 
2014
 
 
 
 
 
 
 
 
Federal statutory income tax rate
35
 %
 
35
 %
 
35
 %
 
35
 %
Income tax credits
(66
)
 
(62
)
 
(62
)
 
(55
)
State income tax, net of federal income tax benefit
(8
)
 
(3
)
 
(3
)
 
1

Effects of ratemaking
(13
)
 
(8
)
 
(12
)
 
(5
)
Other, net
—

 
(1
)
 
—

 
(1
)
Effective income tax rate
(52
)%
 
(39
)%
 
(42
)%
 
(25
)%