Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer.

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Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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