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Risk Management Activities - Netting Arrangements (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Current risk management liabilities    
Disclosure of financial liabilities [abstract]    
Gross amounts of recognized financial liabilities $ (504) $ (1,953)
Amounts set off 355 883
Net amounts included on the statement of financial position (149) (1,070)
Master netting arrangements 7 62
Net amount (142) (1,008)
Long-term risk management liabilities    
Disclosure of financial liabilities [abstract]    
Gross amounts of recognized financial liabilities (145) (449)
Amounts set off 91 43
Net amounts included on the statement of financial position (54) (406)
Master netting arrangements 2 7
Net amount (52) (399)
Accounts payable and accrued liabilities    
Disclosure of financial liabilities [abstract]    
Gross amounts of recognized financial liabilities (760) (1,344)
Amounts set off 646 934
Net amounts included on the statement of financial position (114) (410)
Master netting arrangements 11 176
Net amount (103) (234)
Current risk management assets    
Disclosure of financial assets [abstract]    
Gross amounts of recognized financial assets 528 1,602
Amounts set off (355) (883)
Net amounts included on the statement of financial position 173 719
Master netting arrangements (7) (62)
Net amount 166 657
Long-term risk management assets    
Disclosure of financial assets [abstract]    
Gross amounts of recognized financial assets 161 204
Amounts set off (91) (43)
Net amounts included on the statement of financial position 70 161
Master netting arrangements (2) (7)
Net amount 68 154
Trade and other receivables    
Disclosure of financial assets [abstract]    
Gross amounts of recognized financial assets 789 1,330
Amounts set off (646) (934)
Net amounts included on the statement of financial position 143 396
Master netting arrangements (11) (176)
Net amount $ 132 $ 220