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Other (expense) income - Narrative (Details) - CAD ($)
 3 Months Ended 6 Months Ended
Mar. 01, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disclosure of detailed information about property, plant and equipment [line items]          
Equity gain (loss) from investments in associates and joint ventures   $ (42,000,000) $ (14,000,000) $ (42,000,000) $ (14,000,000)
Equity gain (loss) from investments in subsidiaries   14,000,000   14,000,000  
Net earnings   654,000,000 734,000,000 1,588,000,000 1,421,000,000
Createch          
Disclosure of detailed information about property, plant and equipment [line items]          
Proceeds from sale of subsidiary $ 54,000,000        
Gains on sale of investments       39,000,000  
Tax expense on gain of invesments   $ 2,000,000   2,000,000  
Revenue     17,000,000 10,000,000 34,000,000
Net earnings     $ 1,000,000 $ 0 $ 1,000,000