Investments - Narrative (Details) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investment in PrairieSky Royalty Ltd.
Disclosure of detailed information about financial instruments [line items]
Number of shares held as investment (in shares)	22.6
Market price per common share (CAD per share)	$ 13.63	$ 10.09	$ 15.23
Investment in Inter Pipeline Ltd.
Disclosure of detailed information about financial instruments [line items]
Number of shares held as investment (in shares)	6.4
Market price per common share (CAD per share)		$ 11.87	$ 22.54
Cash proceeds	$ 128
Cash proceeds per common share (CAD per share)	$ 20.00