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Income Taxes (LLC) (Tables) (MidAmerican Funding, LLC and Subsidiaries [Domain])
 9 Months Ended
Sep. 30, 2013
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
 
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
(74
)
 
(54
)
 
(70
)
 
(55
)
State income tax, net of federal income tax benefit
(2
)
 
(3
)
 
(3
)
 
(6
)
Income tax method change
—

 
—

 
—

 
(8
)
Effects of ratemaking
(5
)
 
—

 
(5
)
 
(1
)
Other, net
—

 
(4
)
 
1

 
(1
)
Effective income tax rate
(46
)%
 
(26
)%
 
(42
)%
 
(36
)%