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Deferred unrecognized tax benefits.

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Income Tax [Line Items]

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Percentage of deferred tax asset that was recorded as a valuation allowance.

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Date the entity disposed of a business or a group of assets, in YYYY-MM-DD format.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Expiration date of each operating loss carryforward included in operating loss carryforward, in YYYY-MM-DD format.

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The amount of cash received during the period as refunds for the overpayment of taxes.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of expense for penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of interest expense for an underpayment of income taxes.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2021	Jan. 07, 2021
Income Tax [Line Items]
Deferred income taxes						$ 249,000,000
Federal valuation allowance amount removed		$ 893,000,000	$ 1,355,000,000
Income tax expense (benefit)		65,000,000	(547,000,000)	$ (30,000,000)
Current income tax expense (benefit)		16,000,000	(219,000,000)	(5,000,000)
Deferred income tax expense (benefit)		49,000,000	$ (328,000,000)	(25,000,000)
Valuation allowance against deferred tax assets, percent			100.00%
Unrecognized tax benefits increased		5,000,000		$ 14,000,000
Net operating loss carryforwards, deferred tax assets		1,075,000,000	$ 238,000,000
Net operating loss carryforwards		57,000,000
Unrecognized tax benefits, interest expense (benefit)		1,000,000
Unrecognized tax benefits, penalties		0
Unrecognized tax benefit that would impact effective tax rate		36,000,000	23,000,000
Unrecognized tax benefits, decrease resulting from current period tax positions			42,000,000
Deferred unrecognized tax benefits		42,000,000	50,000,000
Severance tax refunds		39,000,000	40,000,000
AMT Credit Carryforward [Member]
Income Tax [Line Items]
Severance tax refunds		83,000,000
U.S. [Member]
Income Tax [Line Items]
Income tax expense (benefit)	$ (16,000,000)
Canadian Business Segment [Member]
Income Tax [Line Items]
Effective close date of divestiture				Jun. 27, 2019
CARES Act [Member]
Income Tax [Line Items]
Income tax expense (benefit)			(113,000,000)
Current income tax expense (benefit)			(220,000,000)
Deferred income tax expense (benefit)			$ 107,000,000
United States Federal [Member]
Income Tax [Line Items]
Federal valuation allowance amount removed		303,000,000
Net operating loss carryforwards		711,000,000
United States Federal [Member] \| Expiring in 2037 [Member]
Income Tax [Line Items]
Net operating loss carryforwards		$ 654,000,000
United States Federal [Member] \| Maximum [Member]
Income Tax [Line Items]
Net operating loss carryforward, expiration date		Dec. 31, 2037
United States Federal [Member] \| Minimum [Member]
Income Tax [Line Items]
Net operating loss carryforward, expiration date		Dec. 31, 2030
Various U.S. States [Member]
Income Tax [Line Items]
Net operating loss carryforwards		$ 364,000,000
Various U.S. States [Member] \| Maximum [Member]
Income Tax [Line Items]
Net operating loss carryforward, expiration date		Dec. 31, 2040
Various U.S. States [Member] \| Minimum [Member]
Income Tax [Line Items]
Net operating loss carryforward, expiration date		Dec. 31, 2022
Canada [Member]
Income Tax [Line Items]
Federal valuation allowance amount removed		$ 559,000,000
WPX Merger [Member]
Income Tax [Line Items]
Deferred income taxes					$ 249,000,000
WPX Merger [Member] \| United States Federal [Member]
Income Tax [Line Items]
Federal valuation allowance amount removed		$ 84,000,000