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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Beginning balance, short-term borrowings     $ 79  
Beginning balance, lease liabilities     2,957  
Changes From Financing Cash Flows:        
(Repayment) of Long-Term Debt $ (750) $ 0 (1,260) $ 0
Payments of lease liabilities (75) (77) (150) (152)
Non-Cash Changes:        
Net premium (discount) on redemption of long-term debt   0 (25) 0
Lease Additions     (3)  
Lease Modifications     (42)  
Lease Terminations     (1)  
Ending balance, short term borrowings 0   0  
Ending Balance, lease liabilities 2,866   2,866  
Dividends Payable | Common shares        
Changes From Financing Cash Flows:        
Dividends Paid     (276) (71)
Non-Cash Changes:        
Increase (Decrease) Through Dividends Declared Liabilities Arising From Financing Activities     276 71
Dividends Payable | Preference shares        
Changes From Financing Cash Flows:        
Dividends Paid     (17) (17)
Non-Cash Changes:        
Increase (Decrease) Through Dividends Declared Liabilities Arising From Financing Activities     17 17
Short-Term Borrowings        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Beginning balance, short-term borrowings     79 121
Acquisition       (40)
Changes From Financing Cash Flows:        
Net Issuance Repayment Of Short Term Borrowings     (79) (89)
Non-Cash Changes:        
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities       (7)
Ending balance, short term borrowings 0 65 0 65
Long-Term Debt        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Beginning balance, long-term debt     12,385 7,441
Acquisition       (6,602)
Changes From Financing Cash Flows:        
(Repayment) of Long-Term Debt     (1,260) (350)
Non-Cash Changes:        
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities     146 (280)
Net premium (discount) on redemption of long-term debt     (25)  
Finance Costs     (18) (33)
Ending balance, long-term debt 11,228 13,380 11,228 13,380
Lease Liabilities        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Beginning balance, lease liabilities     2,957 1,757
Acquisition       (1,441)
Changes From Financing Cash Flows:        
Payments of lease liabilities     (150) (152)
Non-Cash Changes:        
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities     12 (20)
Lease Additions     3 58
Lease Modifications     42 6
Re Measurement Of Lease Liabilities     3 (3)
Lease Terminations     1  
Ending Balance, lease liabilities $ 2,866 $ 3,087 $ 2,866 $ 3,087