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Risk Management Activities - Impacts of currency rate risk (Details) - Currency risk - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of credit risk exposure [line items]      
Net earnings increase (decrease) $ (14) $ (14) $ (12)
OCI gain 0 0 1
USD      
Disclosure of credit risk exposure [line items]      
Net earnings increase (decrease) (11) (12) (13)
OCI gain 0 0 1
AUD      
Disclosure of credit risk exposure [line items]      
Net earnings increase (decrease) (3) (2) 1
OCI gain $ 0 $ 0 $ 0