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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended | 30 Months Ended
--- | --- | --- | --- | ---
Jul. 01, 2020 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2022
Income Tax Examination [Line Items] |  |  |  |  |  |
Canadian federal and provincial corporate tax rate |  |  | 24.00% | 26.00% | 27.00% |
Foreign |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Net operating loss carryforwards |  |  | $ 9 |  |  |
Alberta Government, Canada |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Canadian federal and provincial corporate tax rate | 8.00% | 12.00% |  |  |  |
Deferred tax benefit from change in tax rate |  | $ 60 |  |  |  |
Alberta Government, Canada | Forecast |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Canadian federal and provincial corporate tax rate |  |  |  |  |  | 8.00%
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 |  |  |

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- Definition Represents the amount paid of the amount assessed related to an income tax examination which the reporting entity disputes. + References No definition available. + Details
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- Definition 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 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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