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Divestitures and Other Transactions - Narrative (Details) a in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Aug. 31, 2020 USD ($) a | Dec. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Impairment and related charges |  |  | $ 8,600 |  |  |
Subsequent Event | Variable rate bonds due February 2021 |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Maturity of notes | 2 years |  |  |  |  |
Ghana Assets |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Impairment and related charges |  | $ 1,400 |  | $ 1,400 |  |
Discontinued Operations, Disposed of by Sale | Wyoming, Colorado, and Utah Assets |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Area of land sold (acres) | a |  |  |  |  | 4.5 |
Fee surface sold (acres) | a |  |  |  |  | 1.0 |
Agreement consideration |  |  |  |  | $ 1,330 |
Discontinued Operations, Disposed of by Sale | Wyoming, Colorado, and Utah Assets | Subsequent Event |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net proceeds from sale | $ 1,000 |  |  |  |  |
Liabilities satisfied associated with future royalties | 329 |  |  |  |  |
Loss on sale of assets | 431 |  |  |  |  |
Discontinued Operations, Disposed of by Sale | Columbia Assets |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Loss associated with remeasuring assets to fair value |  | 356 |  |  |  |
Discontinued Operations, Disposed of by Sale | Columbia Assets | Subsequent Event |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Property, plant and equipment, net | $ 587 |  |  |  |  |
Discontinued Operations, Disposed of by Sale | Ghana Assets |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Impairment and related charges |  |  | 1,400 |  |  |
Discontinued Operations, Held-for-sale | Wyoming, Colorado, and Utah Assets |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Property, plant and equipment, net |  | 1,400 |  | 1,400 |  |
Total Liabilities |  | 338 |  | 338 |  |
Discontinued Operations, Held-for-sale | Ghana Assets |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Property, plant and equipment, net |  | 1,400 |  | 1,400 |  | $ 3,600
Deferred income taxes presented in liabilities held for sale |  | $ 750 |  | $ 750 |  |
Impairment and related charges |  |  | $ 2,200 |  |  |

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