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Risk Management Activities - Netting Arrangements (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Current risk management liabilities    
Disclosure of financial liabilities [abstract]    
Gross amounts of recognized financial liabilities $ (1,953) $ (529)
Amounts set off 883 307
Net amounts presented on the statement of financial position (1,033) (211)
Master netting arrangements 62 92
Net amount (971) (119)
Long-term risk management liabilities    
Disclosure of financial liabilities [abstract]    
Gross amounts of recognized financial liabilities (449) (89)
Amounts set off 43 16
Net amounts presented on the statement of financial position (402) (70)
Master netting arrangements 7 23
Net amount (395) (47)
Accounts payable and accrued liabilities    
Disclosure of financial liabilities [abstract]    
Gross amounts of recognized financial liabilities (1,344) (689)
Amounts set off 934 571
Net amounts presented on the statement of financial position (411) (118)
Master netting arrangements 176 35
Net amount (235) (83)
Current risk management assets    
Disclosure of financial assets [abstract]    
Gross amounts of recognized financial assets 1,602 636
Amounts set off (883) (307)
Net amounts presented on the statement of financial position 688 316
Master netting arrangements (62) (92)
Net amount 626 224
Long-term risk management assets    
Disclosure of financial assets [abstract]    
Gross amounts of recognized financial assets 204 285
Amounts set off (43) (16)
Net amounts presented on the statement of financial position 157 260
Master netting arrangements (7) (23)
Net amount 150 237
Trade and other receivables    
Disclosure of financial assets [abstract]    
Gross amounts of recognized financial assets 1,330 699
Amounts set off (934) (571)
Net amounts presented on the statement of financial position 396 128
Master netting arrangements (176) (35)
Net amount $ 220 $ 93