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Supplementary Cash Flow Information - Summary of Reconciliation of Liabilities to Cash Flows from Financing Activities (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance, lease liabilities $ 1,757 $ 1,916  
Changes From Financing Cash Flows:      
Issuance of Long-Term Debt 1,557 1,326 $ 0
(Repayment) of Long-Term Debt (2,870) (112) (2,279)
Principal Repayment of Leases (300) (197) (150)
Non-Cash Changes:      
Lease Additions 110 49  
Lease Terminations (1) (1)  
Lease Modifications 22 (2)  
Transfers to Liabilities Related to Assets Held for Sale (58)    
Other (8) 0 0
Ending Balance, lease liabilities 2,957 1,757 1,916
Dividends Payable | Common shares      
Changes From Financing Cash Flows:      
Dividends Paid (176) (77) (260)
Non-Cash Changes:      
Common Share Dividends Declared 176 77 260
Dividends Payable | Preferred Shares      
Changes From Financing Cash Flows:      
Dividends Paid (34)    
Non-Cash Changes:      
Common Share Dividends Declared 34    
Short-Term Borrowings      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance, debt 121 0  
Changes From Financing Cash Flows:      
Net Issuance (Repayment) of Short-Term Borrowings (77) 117  
Acquisition (see Note 5A) 40    
Non-Cash Changes:      
Foreign Exchange (Gain) Loss, Net (5) 4  
Ending balance, debt 79 121 0
Long-Term Debt      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance, debt 7,441 6,699 9,164
Changes From Financing Cash Flows:      
Issuance of Long-Term Debt 1,557 1,326 276
(Repayment) of Long-Term Debt (2,870) (112) (2,279)
Net Issuance (Repayment) of Revolving Long-Term Debt (350) (220)  
Acquisition (see Note 5A) 6,602    
Non-Cash Changes:      
Foreign Exchange (Gain) Loss, Net (57) (231) (399)
Net Premium (Discount) on Redemption of Long-Term Debt 121   (63)
Net Premium (Discount) on Redemption of Long-Term Debt   (25)  
Finance Costs (59) 5  
Other   (1)  
Ending balance, debt 12,385 7,441 6,699
Lease Liabilities      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance, lease liabilities 1,757 1,916  
Changes From Financing Cash Flows:      
Principal Repayment of Leases (300) (197) (150)
Acquisition (see Note 5A) 1,441    
Non-Cash Changes:      
Foreign Exchange (Gain) Loss, Net (10) (6) (23)
Lease Additions 110 49 590
Lease Terminations (1) (1) (11)
Lease Modifications 22 (2)  
Lease Re-measurements (4) (2) 15
Other     1
Ending Balance, lease liabilities $ 2,957 $ 1,757 1,916
Lease Liabilities | I F R S16 | Adjustments      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance, lease liabilities     $ 1,494