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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 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Disclosure of reconciliation of liabilities arising from financing activities [line items]          
Beginning balance, short-term borrowings     $ 115    
Beginning balance, lease liabilities     2,836    
Changes From Financing Cash Flows:          
(Repayment) of Long-Term Debt $ (1,346) $ (2,889) (1,346) $ (4,149)  
Principal Repayment of Leases (70) (78) (216) (228)  
Payment for Purchase of Warrants (600) 0 (600) 0  
Non-Cash Changes:          
Net Premium (Discount) on Redemption of Long-Term Debt (84) (4) (84) (29)  
Lease Additions     45    
Lease Modifications     34    
Lease Re-measurements     8    
Ending balance, short term borrowings 14   14   $ 115
Ending Balance, lease liabilities 2,733   2,733   2,836
Dividends Payable          
Disclosure of reconciliation of liabilities arising from financing activities [line items]          
Beginning balance. dividend payables     9 0 0
Non-Cash Changes:          
Beginning balance. dividend payables 9 0 9 0 9
Dividends Payable | Common shares          
Changes From Financing Cash Flows:          
Dividends Paid     (729) (481)  
Non-Cash Changes:          
Dividends declared     729 481  
Dividends Payable | Preference shares          
Changes From Financing Cash Flows:          
Dividends Paid     (27) (26)  
Non-Cash Changes:          
Dividends declared     27 26  
Warrant Purchase Payable          
Disclosure of reconciliation of liabilities arising from financing activities [line items]          
Beginning balance, warrant payable     0 0 0
Changes From Financing Cash Flows:          
Payment for Purchase of Warrants     (600)    
Finance and Transaction Costs     (2)    
Non-Cash Changes:          
Finance Costs     2    
Purchased and Cancelled     711    
Ending balance, warrant payable 111 0 111 0 0
Short-Term Borrowings          
Disclosure of reconciliation of liabilities arising from financing activities [line items]          
Beginning balance, short-term borrowings     115 79 79
Changes From Financing Cash Flows:          
Net Issuance Repayment Of Short Term Borrowings     (101) (81)  
Non-Cash Changes:          
Lease Acquisitions     0    
Exchange Rate Movements and Other     0 2  
Ending balance, short term borrowings 14 0 14 0 115
Long-Term Debt          
Disclosure of reconciliation of liabilities arising from financing activities [line items]          
Beginning balance, long-term debt     8,691 12,385 12,385
Changes From Financing Cash Flows:          
(Repayment) of Long-Term Debt     (1,346) (4,149)  
Non-Cash Changes:          
Net Premium (Discount) on Redemption of Long-Term Debt     (84) (29)  
Finance Costs     (15) (24)  
Lease Acquisitions     0    
Exchange Rate Movements and Other     (22) 591  
Ending balance, long-term debt 7,224 8,774 7,224 8,774 8,691
Lease Liabilities          
Disclosure of reconciliation of liabilities arising from financing activities [line items]          
Beginning balance, lease liabilities     2,836 2,957 2,957
Changes From Financing Cash Flows:          
Principal Repayment of Leases     (216) (228)  
Non-Cash Changes:          
Lease Acquisitions     33    
Lease Additions     45 19  
Lease Modifications     34 46  
Lease Re-measurements     (6) 3  
Lease Divestitures     (11)    
Lease Re-measurements     (8) (2)  
Exchange Rate Movements and Other     26 74  
Ending Balance, lease liabilities $ 2,733 $ 2,869 $ 2,733 $ 2,869 $ 2,836