Income Taxes - Narrative (Details) - Parsley - USD ($) $ in Millions	Sep. 30, 2021	Jan. 12, 2021
Valuation Allowance [Line Items]
Deferred income taxes		$ 140
Deferred tax assets, operating loss carryforwards	$ 2,200

Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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