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Income taxes - Summary of Major Components of Company's Income Tax Expense (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]      
Current income tax expense $ 492 $ 526 $ 537
Origination and reversal of temporary differences 101 259 277
Effect of tax rate decrease (25) (11) (32)
Effect of hedge of net investment in foreign subsidiaries 59 (3) (18)
Other 1 (3) (6)
Total deferred income tax expense 136 242 221
Total income taxes 628 768 758
Income before income tax expense      
Canada 2,236 2,899 2,518
Foreign 1,909 721 684
Income before income tax expense 4,145 3,620 3,202
Current      
Canada 333 404 412
Foreign 159 122 125
Total current income tax expense 492 526 537
Deferred      
Canada 177 (179) 231
Foreign (41) 421 (10)
Total deferred income tax expense 136 242 221
Total income taxes $ 628 $ 768 $ 758