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Income Taxes (LLC) (Tables)
 6 Months Ended
Jun. 30, 2015
MidAmerican Funding, LLC and Subsidiaries [Domain]  
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 Funding'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
(70
)
 
(79
)
 
(60
)
 
(58
)
State income tax, net of federal income tax benefit
(9
)
 
(5
)
 
(3
)
 
1

Effects of ratemaking
(13
)
 
(10
)
 
(11
)
 
(5
)
Other, net
—

 
1

 
(1
)
 
(1
)
Effective income tax rate
(57
)%
 
(58
)%
 
(40
)%
 
(28
)%