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Significant and Subsequent Events - Pioneer Pipeline and Skookumchuck Wind Project (Details)
$ in Millions, $ in Millions
12 Months Ended
Nov. 25, 2020
CAD ($)
MW
Nov. 25, 2020
USD ($)
Oct. 01, 2020
CAD ($)
Apr. 12, 2019
Dec. 17, 2018
MMcf
Dec. 31, 2020
CAD ($)
J
Dec. 31, 2020
terajoule
Nov. 01, 2019
MMcf
Investment [Line Items]                
Long-term firm natural gas delivery transportation, amount transferred per day           400 400  
SP Skookumchuck Investment, LLC                
Investment [Line Items]                
Other cash payments to acquire interests in joint ventures, classified as investing activities           $ 86    
NOVA Gas Transmission Ltd.                
Investment [Line Items]                
Long-term firm natural gas delivery transportation, amount transferred per day           351 275  
Tidewater                
Investment [Line Items]                
Long-term firm natural gas delivery transportation, amount transferred per day           139 139  
Pioneer Pipeline                
Investment [Line Items]                
Future option to acquire pipeline, ownership percentage         50.00%      
Pioneer Pipeline | Tidewater                
Investment [Line Items]                
Proportion of ownership interest in joint operation         50.00%      
Take or pay agreement, term           15 years    
Natural gas pipeline capacity (mmcf) | MMcf         50     130
Payments for development project expenditure           $ 83    
Pioneer Pipeline | Tidewater | Discontinued operations                
Investment [Line Items]                
Proceeds from sale of assets held for sale     $ 255          
Skookumchuck                
Investment [Line Items]                
Proportion of ownership interest in joint operation 49.00% 49.00%   49.00%        
Other cash payments to acquire interests in joint ventures, classified as investing activities $ 86 $ 66            
Capacity of facility (in megawatts) | MW 136.8              
Investments in joint ventures $ 163              
Value of equity consideration received $ 77 $ 59