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Other comprehensive income (loss) and accumulated other comprehensive loss - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Unrealized foreign exchange (loss) gain on: Before tax amount      
Translation of the net investment in U.S. subsidiaries and equity method investees, before tax $ 2,099 $ (316) $ (118)
Translation of the U.S. dollar-denominated long-term debt designated as a hedge of the net investment in U.S. subsidiaries and equity method investees, before tax (471) 25 136
Realized loss on derivatives designated as cash flow hedges recognized in income, before tax 6 10 10
Unrealized gain on cash flow hedges, before tax   38  
Change in pension and other benefits actuarial gains and losses, before tax 706 1,286 (403)
Change in prior service pension and other benefit costs, before tax (26)   (4)
Equity accounted investments, before tax (5) 9 (1)
Other comprehensive (loss) income: Before tax amount 2,309 1,052 (380)
Unrealized foreign exchange gain (loss) on: Income tax (expense) recovery      
Translation of the net investment in U.S. subsidiaries and equity method investees, tax 0 0 0
Translation of the U.S. dollar-denominated long-term debt designated as a hedge of the net investment in U.S. subsidiaries equity method investees, tax 59 (3) (18)
Realized loss on derivatives designated as cash flow hedges recognized in income, tax (2) (3) (3)
Unrealized gain on cash flow hedges, tax   (9)  
Change in pension and other benefits actuarial gains and losses, tax (182) (323) 108
Change in prior service pension and other benefit costs, tax 7   1
Equity accounted investments 3 (3) 0
Other comprehensive (loss) income: Income tax (expense) recovery (115) (341) 88
Unrealized foreign exchange gain (loss) on: Net of tax amount      
Translation of the net investment in U.S. subsidiaries equity method investees, after tax 2,099 (316) (118)
Translation of the U.S. dollar-denominated long-term debt designated as a hedge of the net investment in U.S. subsidiaries equity method investees, after tax (412) 22 118
Realized loss on derivatives designated as cash flow hedges recognized in income, after tax 4 7 7
Unrealized gain on cash flow hedges, after tax   29  
Change in pension and other benefits actuarial gains and losses, after tax 524 963 (295)
Change in prior service pension and other benefit costs, after tax (19)   (3)
Equity accounted investments, after tax (2) 6 (1)
Other comprehensive income (loss) $ 2,194 $ 711 $ (292)