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Asset Retirement Obligations - Narrative (Details) $ in Millions | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Asset Retirement Obligation [Line Items] |  |
Environmental rehabilitation trust assets | $ 19 | $ 16
Minimum | Mines |  |
Asset Retirement Obligation [Line Items] |  |
Estimated useful life (in years) | 1 year |
Minimum | Other |  |
Asset Retirement Obligation [Line Items] |  |
Estimated useful life (in years) | 3 years |
Minimum | Measurement Input, Discount Rate |  |
Asset Retirement Obligation [Line Items] |  |
Measurement input in determining asset retirement obligation (in percent) | 0.016 |
Minimum | Measurement Input, Risk Free Interest Rate |  |
Asset Retirement Obligation [Line Items] |  |
Measurement input in determining asset retirement obligation (in percent) | 0.050 |
Maximum | Mines |  |
Asset Retirement Obligation [Line Items] |  |
Estimated useful life (in years) | 45 years |
Maximum | Other |  |
Asset Retirement Obligation [Line Items] |  |
Estimated useful life (in years) | 42 years |
Maximum | Measurement Input, Discount Rate |  |
Asset Retirement Obligation [Line Items] |  |
Measurement input in determining asset retirement obligation (in percent) | 0.055 |
Maximum | Measurement Input, Risk Free Interest Rate |  |
Asset Retirement Obligation [Line Items] |  |
Measurement input in determining asset retirement obligation (in percent) | 0.201 |

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- Definition Amount of costs recognized in the balance sheet for known or estimated future costs arising from requirements to perform activities to remediate one or more sites. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 25 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482049/410-30-25-18 + Details
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