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Equity - Summary of Accumulated Other Comprehensive Income (Loss) (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of analysis of other comprehensive income by item [line items]    
Accumulated other comprehensive income - beginning of year $ 244 $ 450
IFRS 9 transition adjustment on January 1, 2018 (Note 32(c)) (34)  
Unrealized loss on marketable equity and debt securities (2017 - available-for-sale financial assets) (net of taxes of $1 and $1) (10)  
Realized gain on marketable equity and debt securities (net of taxes of $nil and $nil) 1  
Other comprehensive income net of tax marketable equity and debt securities (2017 - Available-for-sale financial assets) (9) (10)
Share of other comprehensive loss of associates and joint ventures   (1)
Remeasurements of retirement benefit plans (net of taxes of $(2) and $(55)) 8 129
Total other comprehensive income (loss) 382 (77)
Less remeasurements of retirement benefit plans recorded in retained earnings (8) (129)
Accumulated other comprehensive income - end of year 584 244
Available-for-sale financial assets [member]    
Disclosure of analysis of other comprehensive income by item [line items]    
Unrealized loss on marketable equity and debt securities (2017 - available-for-sale financial assets) (net of taxes of $1 and $1)   (4)
Realized loss on available-for-sale financial assets reclassified to profit (net of taxes of $nil and $1)   (6)
Currency translation differences [member]    
Disclosure of analysis of other comprehensive income by item [line items]    
Unrealized gains (losses) on translation of foreign subsidiaries 638 (536)
Foreign exchange differences on debt designated as a hedge of our investment in foreign subsidiaries (net of taxes of $40 and $(46)) (255) 341
Other comprehensive income net of tax exchange differences on translation $ 383 $ (195)