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Investments - Inter Pipeline (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]      
(Gain) loss from investment $ (141) $ 171 $ 293
Investment in Inter Pipeline Ltd.      
Disclosure of financial assets [line items]      
(Gain) loss from investment (51) 68 (21)
Dividend income (2) (5) (11)
(Gain) loss from investment $ (53) $ 63 $ (32)