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General - Narrative (Details) - Discontinued Operations - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2021
Ecuador Operations
Summary of Significant Accounting Policies [Line Items]
Loss from discontinued operations	$ 407
Ghana Operations
Summary of Significant Accounting Policies [Line Items]
Loss from discontinued operations		$ 35

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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