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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2022
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | 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:
| Year Ended December 31,
| 2022 |  | 2021
Balance, January 1 | $ | 149 |  |  | $ | 166 |
Additions | 3 |  |  | 5 |
Accretion expense | 12 |  |  | 12 |
Remeasurement/translation | (7) |  |  | (9) |
Changes in estimates, including cost and timing of cash flows | 7 |  |  | (15) |
Settlements/payments | (3) |  |  | (10) |
Other acquisition and divestiture related | — |  |  | — |
Balance, December 31 | $ | 161 |  |  | $ | 149 |
| December 31,
| 2022 |  | 2021
Asset retirement obligations were classified as follows: |  |  |
Current portion included in “Accrued liabilities” | $ | 8 |  |  | $ | 10 |
Noncurrent portion included in “Asset retirement obligations” | 153 |  |  | 139 |
Asset retirement obligations | $ | 161 |  |  | $ | 149 |
We used the following assumptions in determining asset retirement obligations at December 31, 2022: inflation rates between 1.5% - 4.3% per year; credit adjusted risk-free interest rates between 5.8% -20.6%; the life of mines between 1-24 years and the useful life of assets between 6-31 years. Environmental Rehabilitation Trust In accordance with applicable regulations, we have established an environmental rehabilitation trust for the prospecting and mining operations in South Africa, which receives, holds, and invests funds for the rehabilitation or management of asset retirement obligations. The trustees of the fund are appointed by us and consist of sufficiently qualified employees capable of fulfilling their fiduciary duties. At December 31, 2022 and 2021, the environmental rehabilitation trust assets were $12 million and $12 million, respectively, which were recorded in “Other long-term assets” in the Consolidated Balance Sheets.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI https://asc.fasb.org/subtopic&trid=2175671 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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