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Supplemental Cash Flow Information - Reconciliation of movements of liabilities to cash flows (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Short-Term Debt    
Reconciliation of movements of liabilities to cash flows arising from financing activities    
Liabilities arising from financing activities at beginning of period $ 1,284 $ 3,566
Changes from financing cash flows:    
(Reduction) Issuance of commercial paper 1,473 (2,256)
Realized foreign exchange (gains) and losses (19) (79)
Non-cash changes:    
Unrealized foreign exchange losses and (gains) 69 53
Liabilities arising from financing activities at end of period 2,807 1,284
Current Portion of Long-Term Lease Liabilities    
Reconciliation of movements of liabilities to cash flows arising from financing activities    
Liabilities arising from financing activities at beginning of period 310 272
Changes from financing cash flows:    
Realized foreign exchange (gains) and losses 15  
Lease liability payments (329) (325)
Non-cash changes:    
Reclassification of lease obligations 321 363
Liabilities arising from financing activities at end of period 317 310
Long-Term Lease Liabilities    
Reconciliation of movements of liabilities to cash flows arising from financing activities    
Liabilities arising from financing activities at beginning of period 2,540 2,636
Non-cash changes:    
Unrealized foreign exchange losses and (gains) (25)  
Lease derecognition (22) (41)
Reclassification of lease obligations (321) (363)
New lease liabilities 523 308
Liabilities arising from financing activities at end of period 2,695 2,540
Current Portion of Long-Term Debt    
Reconciliation of movements of liabilities to cash flows arising from financing activities    
Liabilities arising from financing activities at beginning of period 231 1,413
Changes from financing cash flows:    
Repayment of long-term debt (233) (2,451)
Loss on extinguishment of long-term debt   80
Realized foreign exchange (gains) and losses 2 128
Other   25
Non-cash changes:    
Unrealized foreign exchange losses and (gains)   (47)
Reclassification of debt   1,083
Liabilities arising from financing activities at end of period 0 231
Long-Term Debt    
Reconciliation of movements of liabilities to cash flows arising from financing activities    
Liabilities arising from financing activities at beginning of period 13,989 13,812
Changes from financing cash flows:    
Gross proceeds from issuance of long-term debt   1,446
Debt issuance costs   (23)
Repayment of long-term debt (4,895)  
Loss on extinguishment of long-term debt 32  
Realized foreign exchange (gains) and losses (91)  
Other (13)  
Non-cash changes:    
Unrealized foreign exchange losses and (gains) 778 (168)
Reclassification of debt   (1,083)
Deferred financing costs   5
Liabilities arising from financing activities at end of period 9,800 13,989
Partnership Liability    
Reconciliation of movements of liabilities to cash flows arising from financing activities    
Liabilities arising from financing activities at beginning of period 427 436
Changes from financing cash flows:    
Distributions to non-controlling interest (14) (9)
Non-cash changes:    
Liabilities arising from financing activities at end of period 413 427
Dividends Payable    
Reconciliation of movements of liabilities to cash flows arising from financing activities    
Liabilities arising from financing activities at beginning of period 0 0
Changes from financing cash flows:    
Dividends paid on common shares (2,596) 1,550
Non-cash changes:    
Dividends declared on common shares 2,596 (1,550)
Liabilities arising from financing activities at end of period $ 0 $ 0