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Supplementary Cash Flow Information - Summary of Reconciliation of Cash Flows from Financing Activities (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]      
Lease Liabilities, Beginning of Year $ 1,916 $ 1,494  
Changes From Financing Cash Flows:      
Repayment of Long-Term Debt (112) (2,279) $ (1,144)
Principal Repayment of Leases (197) (150)  
Issuance of Long-Term Debt 1,326    
Non-Cash Changes:      
Additions 49 590  
Lease Terminations 1 11  
Lease Modifications (2)    
Other     (1)
Lease Liabilities, End of Year 1,757 1,916 1,494
Ending balance 121    
Dividends Payable [Member]      
Changes From Financing Cash Flows:      
Dividends Paid (77) (260) (245)
Non-Cash Changes:      
Dividends Declared 77 260 245
Short-Term Borrowings [Member]      
Changes From Financing Cash Flows:      
Issuance (Repayment) of Short-Term Borrowings 117    
Non-Cash Changes:      
Foreign Exchange (Gain) Loss 4    
Ending balance 121    
Long-term Borrowings [Member]      
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]      
Beginning balance 6,699 9,164 9,513
Changes From Financing Cash Flows:      
Repayment of Long-Term Debt (112) (2,279) (1,144)
Net Issuance (Repayment) of Revolving Long-Term Debt (220) 276 (20)
Issuance of Long-Term Debt 1,326    
Non-Cash Changes:      
Foreign Exchange (Gain) Loss (231) (399) 817
Finance Costs     (2)
Gain on Repurchase of Debt and Amortization of Debt Issuance Costs (20) (63)  
Other (1)    
Ending balance 7,441 6,699 $ 9,164
Lease liabilities [member]      
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]      
Lease Liabilities, Beginning of Year 1,916    
Changes From Financing Cash Flows:      
Principal Repayment of Leases (197) (150)  
Non-Cash Changes:      
Foreign Exchange (Gain) Loss (6) (23)  
Additions 49 590  
Re-measurement of Lease Liabilities (2) 15  
Lease Terminations (1) (11)  
Lease Modifications (2)    
Other   1  
Lease Liabilities, End of Year 1,757 1,916  
Lease liabilities [member] | IFRS 16 [Member] | Adjustments [Member]      
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]      
Lease Liabilities, Beginning of Year $ 1,494    
Non-Cash Changes:      
Lease Liabilities, End of Year   $ 1,494