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Financial Instruments Sensitivity ranges for the base fair values (Details)
number in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Base fair value $ 3,104 $ 3,234
Long-term power sale – US | Long-term contracts    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Base fair value 737 801
Unit contingent power purchases    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Base fair value (6) 18
Structured products – Eastern US    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Base fair value 7 6
Full requirements – Eastern US    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Base fair value 10 0
Long-term wind energy sale – Eastern US    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Base fair value (28) (39)
Others    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Base fair value $ 0 $ 9
Maximum | Long-term power sale – US | Long-term contracts    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Sensitivity ranges for the base fair value, reasonably possible change in risk assumption, financial instruments (46) (116)
Maximum | Unit contingent power purchases    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Sensitivity ranges for the base fair value, reasonably possible change in risk assumption, financial instruments (1) (4)
Maximum | Structured products – Eastern US    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Sensitivity ranges for the base fair value, reasonably possible change in risk assumption, financial instruments (2) (5)
Maximum | Full requirements – Eastern US    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Sensitivity ranges for the base fair value, reasonably possible change in risk assumption, financial instruments (3) 0
Maximum | Long-term wind energy sale – Eastern US    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Sensitivity ranges for the base fair value, reasonably possible change in risk assumption, financial instruments (20) (21)
Maximum | Others    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Sensitivity ranges for the base fair value, reasonably possible change in risk assumption, financial instruments (7) (3)
Minimum | Long-term power sale – US | Long-term contracts    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Sensitivity ranges for the base fair value, reasonably possible change in risk assumption, financial instruments 139 116
Minimum | Unit contingent power purchases    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Sensitivity ranges for the base fair value, reasonably possible change in risk assumption, financial instruments 1 4
Minimum | Structured products – Eastern US    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Sensitivity ranges for the base fair value, reasonably possible change in risk assumption, financial instruments 2 5
Minimum | Full requirements – Eastern US    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Sensitivity ranges for the base fair value, reasonably possible change in risk assumption, financial instruments 3 0
Minimum | Long-term wind energy sale – Eastern US    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Sensitivity ranges for the base fair value, reasonably possible change in risk assumption, financial instruments 20 21
Minimum | Others    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Sensitivity ranges for the base fair value, reasonably possible change in risk assumption, financial instruments 7 3