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Supplementary Cash Flow Information - Summary of Reconciliation of Liabilities to Cash Flows from Financing Activities (Detail) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Beginning balance, short-term borrowings     $ 121  
Beginning balance, lease liabilities     1,757  
Changes From Financing Cash Flows:        
Issuance of Long-Term Debt $ 1,557 $ 1,326 1,557 $ 1,326
(Repayment) of Long-Term Debt (2,336) 0 (2,336) (112)
(Repayment) of Revolving Long-Term Debt 0 (1,444) (350) (220)
Principal Repayment of Leases (70) (45) (222) (149)
Non-Cash Changes:        
Lease Additions     (101)  
Lease Modifications     (6)  
Other (2) 0 (2) 0
Ending Balance, lease liabilities 3,075   3,075  
Ending balance, short term borrowings 48   48  
Dividends Payable | Common shares        
Changes From Financing Cash Flows:        
Dividends Paid     (106) (77)
Non-Cash Changes:        
Common Share Dividends Declared     106 77
Dividends Payable | Preferred Shares        
Changes From Financing Cash Flows:        
Dividends Paid     (26)  
Non-Cash Changes:        
Common Share Dividends Declared     26  
Short-Term Borrowings        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Beginning balance, short-term borrowings     121 0
Changes From Financing Cash Flows:        
Net Issuance (Repayment) of Short-Term Borrowings     (108) 133
Acquisition (see Note 4A)     40  
Non-Cash Changes:        
Foreign Exchange (Gain) Loss, Net     (5) 4
Ending balance, short term borrowings 48 137 48 137
Long-Term Debt        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Beginning balance, long-term debt     7,441 6,699
Changes From Financing Cash Flows:        
Net Issuance (Repayment) of Short-Term Borrowings     (350)  
Issuance of Long-Term Debt     1,557 1,326
(Repayment) of Long-Term Debt     (2,336) (112)
(Repayment) of Revolving Long-Term Debt       (220)
Acquisition (see Note 4A)     6,602  
Non-Cash Changes:        
Foreign Exchange (Gain) Loss, Net     6 127
Net Premium (Discount) on Redemption of Long- Term Debt     115  
Finance Costs     (49)  
Net Premium (Discount) on Redemption of Long- Term Debt       (25)
Other       (1)
Ending balance, long-term debt 12,986 7,797 12,986 7,797
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     (222) (149)
Acquisition (see Note 4A)     1,441  
Non-Cash Changes:        
Foreign Exchange (Gain) Loss, Net     (3) 17
Lease Additions     101 48
Lease Terminations       (1)
Lease Modifications     6 (3)
Lease Re-Measurements     (5) 5
Ending Balance, lease liabilities $ 3,075 $ 1,833 $ 3,075 $ 1,833