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Asset Retirement Obligations (Tables) | 3 Months Ended
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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 |

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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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://www.xbrl.org/2003/role/presentationRef -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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