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Equity - Summary of Accumulated Other Comprehensive Income (Loss) (Detail) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Currency translation differences:    
Gain (loss) on marketable equity and debt securities (net of taxes of $(14) and $1) $ (3) $ (2)
Share of other comprehensive income of associates and joint ventures 1 0
Remeasurements of retirement benefit plans (net of taxes of $13 and $(91)) (45) 171
Foreign exchange differences on debt designated as a hedge of our investment in foreign subsidiaries, tax 9 (2)
Change in fair value of available-for-sale financial instruments, taxes 0 0
Remeasurements of retirement benefit plans, tax 13 (91)
Accumulated other comprehensive income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income – beginning of year 202 247
Currency translation differences:    
Unrealized gain (loss) on translation of foreign subsidiaries 822 (50)
Foreign exchange differences on debt designated as a hedge of our investment in foreign subsidiaries (net of taxes of $9 and $(2)) (Note 30(b)) (56) 11
Other comprehensive income net of tax exchange differences on translation 766 (39)
Gain (loss) on marketable equity and debt securities (net of taxes of $(14) and $1) 93 (6)
Share of other comprehensive income of associates and joint ventures 1 0
Remeasurements of retirement benefit plans (net of taxes of $13 and $(91)) (45) 171
Total other comprehensive income 815 126
Less remeasurements of retirement benefit plans recorded in retained earnings 45 (171)
Accumulated other comprehensive income – end of year 1,062 202
Change in fair value of available-for-sale financial instruments, taxes $ (14) $ 1