Income Taxes (Details) - Alberta Government - USD ($) $ in Millions	3 Months Ended	30 Months Ended
Jun. 30, 2019	Jan. 01, 2022
Income Tax Examination [Line Items]
Alberta provincial corporate income tax rate	12.00%
Deferred tax benefit from change in tax rate	$ 60
Forecast
Income Tax Examination [Line Items]
Alberta provincial corporate income tax rate		8.00%

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Name:	us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration