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Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended			30 Months Ended
	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2022
Income Tax Examination [Line Items]
Canadian federal and provincial corporate tax rate		26.00%	27.00%	27.00%
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		78
Canadian Tax Authorities | Other long-term assets, net | Foreign
Income Tax Examination [Line Items]
Amount of disputed assessments paid		$ 48
Alberta Government, Canada
Income Tax Examination [Line Items]
Canadian federal and provincial corporate tax rate	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%

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- Definition

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- Definition

Represents amount of assessment received related to an income tax examination which the reporting entity disputes.

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- Definition

Represents the amount paid of the amount assessed related to an income tax examination which the reporting entity disputes.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
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- Definition

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

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