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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Asset Retirement Obligations
The following table presents the Company's ARO liabilities by asset type as of December 31 (in millions):
 
2014
 
2013
 
 
 
 
Evaporative ponds and dry ash landfills
$
2

 
$
7

Asbestos
5

 
6

Other
4

 
3

Total asset retirement obligations
$
11

 
$
16
Schedule of Change in Asset Retirement Obligation
The following table reconciles the beginning and ending balances of the Company's ARO liabilities for the years ended December 31 (in millions):

2014
 
2013

 
 
 
Beginning balance
$
16

 
$
15

Change in estimated costs
(6
)
 
—

Accretion
1

 
1

Ending balance
$
11

 
$
16

 
 
 
 
Reflected as:
 
 
 
Other current liabilities
$
3

 
$
—

Other long-term liabilities
8

 
16

 
$
11

 
$
16