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Income Taxes (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])
 3 Months Ended
Mar. 31, 2012
MidAmerican Funding, LLC and Subsidiaries [Domain]
  
Notes to Consolidated Financial Statements [Line Items]  
Income Tax Disclosure [Text Block]
(6)
Income Taxes

A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax (benefit) expense is as follows:

 
Three-Month Periods
 
Ended March 31,
 
2012
 
2011
 
 
 
 
Federal statutory income tax rate
35
 %
 
35
 %
Amortization of investment tax credit
(1
)
 
(1
)
State income tax, net of federal income tax benefit
9

 
7

Renewable electricity production tax credits
(54
)
 
(33
)
Effects of ratemaking
(15
)
 
(5
)
Other, net
(1
)
 
—

Effective income tax rate
(27
)%
 
3
 %

MidAmerican Energy's wind-powered generating facilities are eligible for federal renewable electricity production tax credits for 10 years from the date the facilities were placed in service.