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Asset Retirement Obligations (Tables) | 3 Months Ended
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Mar. 31, 2021
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, |  |
| 2021 |  | 2020 |  |  |  |
Beginning balance | $ | 166 |  |  | $ | 158 |  |  |  |  |
Accretion expense | 3 |  |  | 3 |  |  |  |  |
Remeasurement/translation | (4) |  |  | (21) |  |  |  |  |
Settlements/payments | (2) |  |  | (2) |  |  |  |  |
Measurement period adjustment related to Cristal acquisition | — |  |  | 4 |  |  |  |  |
Balance, March 31, | $ | 163 |  |  | $ | 142 |  |  |  |  |
| March 31, 2021 |  | December 31, 2020
Current portion included in “Accrued liabilities” | $ | 7 |  |  | $ | 9 |
Noncurrent portion included in “Asset retirement obligations” | 156 |  |  | 157 |
Asset retirement obligations | $ | 163 |  |  | $ | 166 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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