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Fair Value Measurements (LLC) (Tables) (MidAmerican Funding, LLC and Subsidiaries [Domain])
12 Months Ended
Dec. 31, 2012
MidAmerican Funding, LLC and Subsidiaries [Domain]
 
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
MidAmerican Funding's long-term debt is carried at cost on the Consolidated Financial Statements. The fair value of MidAmerican Funding's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of MidAmerican Funding's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of MidAmerican Funding's long-term debt as of December 31 (in millions):
 
2012
 
2011
 
Carrying
Value
 
Fair Value
 
Carrying
Value
 
Fair Value
 
 
 
 
 
 
 
 
Long-term debt
$
3,584

 
$
4,186

 
$
3,440

 
$
4,038