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Investments - Narrative (Details) - CAD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]      
Gain from investment $ 56 $ 196 $ 141
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) $ 23.20 $ 21.70 $ 13.63
Gain from investment $ 56 $ 196 $ 88
Fair value gain from investment 34 182 81
Dividend income $ 22 $ 14 $ 7
Inter Pipeline Ltd.      
Disclosure of detailed information about financial instruments [line items]      
Number of shares held as investment (in shares)     6.4
Cash proceeds     $ 128
Cash proceeds per common share (CAD per share)     $ 20.00
Gain from investment     $ 53
Fair value gain from investment     51
Dividend income     $ 2