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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 2019
Asset Retirement Obligations [Abstract]  
Asset Retirement Obligations
Activities related to asset retirement obligations were as follows:

  
Three Months Ended
March 31,
 
  
2019
  
2018
 
Beginning balance
 
$
74
  
$
82
 
Additions
  
—
   
4
 
Accretion expense
  
1
   
1
 
Remeasurement/translation
  
—
   
1
 
Settlements/payments
  
—
   
(1
)
Transferred with the sale of Henderson Electrolytic
  
—
   
(4
)
Balance, March 31,
 
$
75
  
$
83
 

Asset retirement obligations were classified as follows:

  
March 31,
2019
  
December 31,
2018
 
Current portion included in “Accrued liabilities”
 
$
5
  
$
6
 
Noncurrent portion included in “Asset retirement obligations”
  
70
   
68
 
Asset retirement obligations
 
$
75
  
$
74