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Asset Retirement Obligations (Tables)
3 Months Ended
Mar. 31, 2022
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Asset retirement obligations consist primarily of rehabilitation and restoration costs, landfill capping costs, decommissioning costs, and closure and post-closure costs. Activities related to asset retirement obligations were as follows:
Three Months Ended
March 31,
20222021
Beginning balance$149 $166 
Accretion expense
Remeasurement/translation(4)
Settlements/payments(2)(2)
Balance, March 31,$155 $163 
March 31, 2022December 31, 2021
Current portion included in “Accrued liabilities”$$10 
Noncurrent portion included in “Asset retirement obligations”146 139 
Asset retirement obligations$155 $149