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Revenue (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Changes in transaction price $ 11 $ 0
Performance obligations satisfied 1 $ 2
Canadian Gas    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Transaction price allocated to remaining performance obligations 31  
Australian Gas    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Transaction price allocated to remaining performance obligations 2,500  
Gas    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Transaction price allocated to remaining performance obligations 336  
Hydro    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Transaction price allocated to remaining performance obligations 46  
Wind and Solar    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Transaction price allocated to remaining performance obligations 9  
Second to fifth years inclusive | Australian Gas    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Transaction price allocated to remaining performance obligations 285  
Minimum | Australian Gas    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Transaction price allocated to remaining performance obligations 85  
Minimum | 2024 | Gas    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Transaction price allocated to remaining performance obligations 5  
Minimum | Annually thereafter | Gas    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Transaction price allocated to remaining performance obligations 40  
Maximum | Australian Gas    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Transaction price allocated to remaining performance obligations 145  
Maximum | 2024 | Gas    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Transaction price allocated to remaining performance obligations 10  
Maximum | Annually thereafter | Gas    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Transaction price allocated to remaining performance obligations $ 45