Government Assistance (Details) - CAD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Government Assistance Received Amount	$ 13
Properties	21,120		$ 21,200
Unamortized Government Assistance	269		$ 259
Amortization Expense Related to Government Assistance	$ 3	$ 3

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant