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Income Taxes (LLC) (Tables) (MidAmerican Funding, LLC and Subsidiaries [Domain])
 3 Months Ended
Mar. 31, 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 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
(65
)
 
(54
)
State income tax, net of federal income tax benefit
(2
)
 
(6
)
Effects of ratemaking
(2
)
 
(3
)
Other, net
2

 
1

Effective income tax rate
(32
)%
 
(27
)%