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Common Share Activities (Detail) - CAD ($)
shares in Thousands, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Class of Stock [Line Items]    
Common stock beginning balance, shares 678,080  
Common stock, ending balance, shares 669,144 678,080
Common stock beginning balance, value [1] $ 1,252  
Common stock, ending balance, value [1] $ 1,237 $ 1,252
Common Stock    
Class of Stock [Line Items]    
Common stock beginning balance, shares 678,080 734,077
Issued under employee share-based awards, shares 0 7
Purchases at stated value, shares (8,936) (56,004)
Common stock, ending balance, shares 669,144 678,080
Common stock beginning balance, value $ 1,252 $ 1,357
Issued under employee share-based awards, value 0 0
Purchases at stated value, value (15) (105)
Common stock, ending balance, value $ 1,237 $ 1,252
[1] Number of common shares authorized and outstanding were 1,100 million and 669 million, respectively (2021 - 1,100 million and 678 million, respectively).