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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 2017
Asset Retirement Obligations [Abstract]  
Activity Related to Asset Retirement Obligations
Asset retirement obligations consist primarily of rehabilitation and restoration costs, landfill capping costs, decommissioning costs, and closure and post-closure costs. Activity related to asset retirement obligations was as follows:

  
Three Months
Ended March 31,
 
  
2017
  
2016
 
Balance, January 1,
 
$
76
  
$
81
 
Accretion expense
  
1
   
1
 
Remeasurement/translation
  
3
   
4
 
Changes in estimates, including cost and timing of cash flows
  
—
   
1
 
Settlements/payments
  
(1
)
  
—
 
Balance, March 31,
 
$
79
  
$
87
 
Schedule of Asset Retirement Obligations
Asset retirement obligations were classified as follows:

  
March 31,
2017
  
December 31,
2016
 
Current portion included in “Accrued liabilities”
 
$
5
  
$
3
 
Noncurrent portion included in “Asset retirement obligations”
  
74
   
73
 
Asset retirement obligations
 
$
79
  
$
76