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Risk Management Activities - Impacts of currency rate risk (Details) - Currency risk - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of credit risk exposure [line items]      
Sensitivity analysis, Net earnings increase (decrease) $ (12) $ (12) $ (24)
Sensitivity analysis, OCI gain 1 1 2
U.S. Dollars      
Disclosure of credit risk exposure [line items]      
Sensitivity analysis, Net earnings increase (decrease) (13) (8) (18)
Sensitivity analysis, OCI gain 1 1 2
Australia, Dollars      
Disclosure of credit risk exposure [line items]      
Sensitivity analysis, Net earnings increase (decrease) 1 (4) (6)
Sensitivity analysis, OCI gain $ 0 $ 0 $ 0