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Property, Plant, and Equipment (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Aug. 01, 2020
CAD ($)
Jun. 30, 2020
CAD ($)
Dec. 31, 2021
CAD ($)
MW
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Sep. 30, 2021
MW
Disclosure of detailed information about property, plant and equipment [line items]            
Impairment charges     $ 345 $ 79    
Property, plant and equipment expenditures     480 486 $ 417  
Mine depreciation     190 144 119  
Interest costs capitalised     $ 14 $ 8 6  
Capitalisation rate of borrowing costs eligible for capitalisation     6.00% 6.00%    
Assets     $ 9,226 $ 9,747    
Net gain on sale of assets     (54) (9) (45)  
PP&E     5,320 5,822 6,207  
Assets Held for Sale            
Disclosure of detailed information about property, plant and equipment [line items]            
Impairment charges     0 0 15  
Energy Transition            
Disclosure of detailed information about property, plant and equipment [line items]            
Net gain on sale of assets     23      
Windrise Wind Facility            
Disclosure of detailed information about property, plant and equipment [line items]            
Property, plant and equipment expenditures     96 156    
WindCharger Battery Storage Project            
Disclosure of detailed information about property, plant and equipment [line items]            
Property, plant and equipment expenditures       6    
Consideration received $ 12          
Kaybob Cogeneration Facility            
Disclosure of detailed information about property, plant and equipment [line items]            
Property, plant and equipment expenditures     14 31    
Centralia Coal Mine            
Disclosure of detailed information about property, plant and equipment [line items]            
Property, plant and equipment expenditures       17    
Genesee Unit 3            
Disclosure of detailed information about property, plant and equipment [line items]            
Consideration received         77  
Kent Hills Wind L.P.            
Disclosure of detailed information about property, plant and equipment [line items]            
Impairment charges     2      
Mine depreciation     $ 12      
Capacity of facility (in megawatts) | MW     167      
SunHills and Centralia            
Disclosure of detailed information about property, plant and equipment [line items]            
PP&E     $ 100      
White Rock Wind Project            
Disclosure of detailed information about property, plant and equipment [line items]            
Property, plant and equipment expenditures     32 0    
Garden Plain Wind Project            
Disclosure of detailed information about property, plant and equipment [line items]            
Property, plant and equipment expenditures     38 0    
Gas generation            
Disclosure of detailed information about property, plant and equipment [line items]            
Increase (decrease) through transfers, property, plant and equipment     200      
PP&E     1,909 1,877 2,036  
Assets under construction            
Disclosure of detailed information about property, plant and equipment [line items]            
PP&E     184 495 228  
Assets under construction | Windrise Wind Facility            
Disclosure of detailed information about property, plant and equipment [line items]            
Increase (decrease) through transfers, property, plant and equipment     255      
Assets under construction | Mount Keith Solar Farm            
Disclosure of detailed information about property, plant and equipment [line items]            
Capacity of facility (in megawatts) | MW           27
Assets under construction | Leinster Solar Farm            
Disclosure of detailed information about property, plant and equipment [line items]            
Capacity of facility (in megawatts) | MW           11
Assets under construction | Leinster battery energy storage system            
Disclosure of detailed information about property, plant and equipment [line items]            
Capacity of facility (in megawatts) | MW           10
Assets under construction | Southern Cross Energy North            
Disclosure of detailed information about property, plant and equipment [line items]            
Capacity of facility (in megawatts) | MW           169
Assets under construction | Kent Hills Wind Rehabilitation Project            
Disclosure of detailed information about property, plant and equipment [line items]            
Increase (decrease) through transfers, property, plant and equipment     7      
Assets under construction | Keephills Unit 1            
Disclosure of detailed information about property, plant and equipment [line items]            
Increase (decrease) through transfers, property, plant and equipment     20      
Assets under construction | Sundance Unit 5            
Disclosure of detailed information about property, plant and equipment [line items]            
Increase (decrease) through transfers, property, plant and equipment     78      
Gross carrying amount            
Disclosure of detailed information about property, plant and equipment [line items]            
Additions     480 486    
Increase (decrease) through transfers, property, plant and equipment     45 (431)    
PP&E     13,389 13,398 13,395  
Gross carrying amount | Centralia            
Disclosure of detailed information about property, plant and equipment [line items]            
PP&E     25      
Gross carrying amount | Gas generation            
Disclosure of detailed information about property, plant and equipment [line items]            
Property, plant and equipment expenditures     91 93    
Additions     0 0    
Increase (decrease) through transfers, property, plant and equipment     232 (138)    
PP&E     4,087 3,935 4,073  
Gross carrying amount | Assets under construction            
Disclosure of detailed information about property, plant and equipment [line items]            
Additions     478 478    
Increase (decrease) through transfers, property, plant and equipment     (696) (211)    
PP&E     184 495 228  
Accumulated depreciation            
Disclosure of detailed information about property, plant and equipment [line items]            
Mine depreciation   $ 15        
Increase (decrease) through transfers, property, plant and equipment     71 (255)    
PP&E     (8,069) (7,576) (7,188)  
Accumulated depreciation | Gas generation            
Disclosure of detailed information about property, plant and equipment [line items]            
Increase (decrease) through transfers, property, plant and equipment     0 (212)    
PP&E     (2,178) (2,058) (2,037)  
Accumulated depreciation | Assets under construction            
Disclosure of detailed information about property, plant and equipment [line items]            
Increase (decrease) through transfers, property, plant and equipment     0 0    
PP&E     $ 0 $ 0 $ 0