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KEYSTONE XL - Impairment of Long-Lived Assets Held and Used (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Estimated Fair Value of Plant, Property and Equipment      
Plant, Property and Equipment $ 75,940 $ 70,182  
Asset impairment charge and other, Pre-tax      
Goodwill and asset impairment charges and other (Notes 6 and 14) 453 2,775 $ 0
Keystone XL      
Asset impairment charge and other, Pre-tax      
Contractual recoveries 571    
Goodwill and asset impairment charges and other (Notes 6 and 14) $ 24 192  
Keystone XL | Liquids Pipelines      
Estimated Fair Value of Plant, Property and Equipment      
Plant, Property and Equipment   175  
Asset impairment charge and other, Pre-tax      
Plant and equipment   412  
Related capital projects in development   230  
Other capitalized costs   2,158  
Capitalized interest   326  
Goodwill and asset impairment charges and other (Notes 6 and 14)   3,126  
Contractual recoveries   (693)  
Contractual and legal obligations related to termination activities   342  
Goodwill and asset impairment charges and other (Notes 6 and 14)   2,775  
Asset impairment charge and other, After-tax      
Plant and equipment   312  
Related capital projects in development   175  
Other capitalized costs   1,642  
Capitalized interest   248  
Asset impairment charge, After-tax   2,377  
Contractual recoveries   (525)  
Contractual and legal obligations related to termination activities   282  
Asset impairment charges, net of tax   2,134  
Keystone XL | Fair Value | Liquids Pipelines      
Estimated Fair Value of Plant, Property and Equipment      
Plant, Property and Equipment   175  
Keystone XL | Fair Value | Plant and equipment | Liquids Pipelines      
Estimated Fair Value of Plant, Property and Equipment      
Plant, Property and Equipment   175  
Keystone XL | Fair Value | Related capital projects in development | Liquids Pipelines      
Estimated Fair Value of Plant, Property and Equipment      
Plant, Property and Equipment   0  
Keystone XL | Fair Value | Other capitalized costs | Liquids Pipelines      
Estimated Fair Value of Plant, Property and Equipment      
Plant, Property and Equipment   0  
Keystone XL | Fair Value | Capitalized interest | Liquids Pipelines      
Estimated Fair Value of Plant, Property and Equipment      
Plant, Property and Equipment   $ 0