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Income Taxes - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	30 Months Ended
	Jul. 01, 2020	Jun. 30, 2019	Jan. 01, 2022	Dec. 31, 2020
U.S. federal
Income Tax Examination [Line Items]
Net operating loss carryforwards				$ 2,328
State
Income Tax Examination [Line Items]
Net operating loss carryforwards				690
Foreign
Income Tax Examination [Line Items]
Net operating loss carryforwards				9
Canadian Tax Authorities | Foreign
Income Tax Examination [Line Items]
Amount of assessments received, including penalty and interest				91
Canadian Tax Authorities | Other long-term assets, net | Foreign
Income Tax Examination [Line Items]
Amount of disputed assessments paid				$ 64
Alberta Government, Canada
Income Tax Examination [Line Items]
Foreign tax rate	8.00%	12.00%
Deferred tax benefit from change in tax rate		$ 60
Alberta Government, Canada | Forecast
Income Tax Examination [Line Items]
Foreign tax rate			8.00%

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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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