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Decommissioning and Other Provisions - Decommissioning and Restoration - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Disclosure of detailed information about borrowings [line items]          
Undiscounted cash amount $ 1,600,000,000        
Revisions in estimated cash flows 100,000,000 $ 179,000,000      
Decrease in PP&E (123,000,000) (6,000,000)      
Reversal of impairment loss (102,000,000) 0      
Revisions in discount rates (225,000,000) (6,000,000)      
Onerous contract provisions 0 (14,000,000) $ (29,000,000)    
Decommissioning and restoration          
Disclosure of detailed information about borrowings [line items]          
Revisions in estimated cash flows 95,000,000 167,000,000      
Decrease in PP&E (49,000,000) (133,000,000)      
Reversal of impairment loss   (34,000,000)      
Revisions in discount rates (225,000,000) (6,000,000)      
Gas And Energy Transition          
Disclosure of detailed information about borrowings [line items]          
Decommissioning and restoration provision   (47,000,000)      
Minimum          
Disclosure of detailed information about borrowings [line items]          
Revisions in discount rates 7.0 3.6      
Maximum          
Disclosure of detailed information about borrowings [line items]          
Revisions in discount rates 0.097 6.5      
Gas          
Disclosure of detailed information about borrowings [line items]          
Decommissioning and restoration provision (46,000,000)        
Centralia Coal Mine          
Disclosure of detailed information about borrowings [line items]          
Onerous contract provisions (10,000,000)        
Centralia Coal Mine | Surety Bonds          
Disclosure of detailed information about borrowings [line items]          
Bonds issued       $ 147 $ 147
Alberta Mine | Letters Of Credit          
Disclosure of detailed information about borrowings [line items]          
Bonds issued 187,000,000 188,000,000      
Royalty Contract          
Disclosure of detailed information about borrowings [line items]          
Onerous contract provisions (7,000,000)        
Wind Sites          
Disclosure of detailed information about borrowings [line items]          
Decommissioning and restoration provision   $ (120,000,000)      
Decommissioning and restoration          
Disclosure of detailed information about borrowings [line items]          
Decommissioning and restoration provision $ (225,000,000)