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Asset Retirement Obligations Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2012
Asset Retirement Obligations [Abstract]  
Asset Retirement Obligations Disclosure [Table Text Block]
The following table reconciles the beginning and ending balances of PacifiCorp's ARO liabilities for the years ended December 31 (in millions):

 
2012
 
2011
 
 
 
 
Beginning balance
$
123

 
$
105

Change in estimated costs(1)
17

 
2

Additions
4

 
29

Retirements
(22
)
 
(19
)
Accretion
5

 
6

Ending balance
$
127

 
$
123

 
 
 
 
Reflected as:
 
 
 
Other current liabilities
$
13

 
$
20

Other long-term liabilities
114

 
103

 
$
127

 
$
123

 
 
 
 

(1)
Results from changes in the timing and amounts of estimated cash flows for certain plant and mine reclamation.