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Dispositions and Other Transactions - Narrative (Details) - USD ($) $ in Billions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 31, 2020 | Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Impairment and related charges |  | $ 8.6 |  |
Ghana Assets |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Impairment and related charges |  | 1.4 | $ 1.4 |
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 |  | 1.3 | $ 1.3 | $ 3.6
Impairment and related charges | $ 1.4 | $ 2.2 |  |

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