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Risk Management Activities - Foreign Currency Rate Risk Management (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial Instruments [Abstract]      
Gains (losses) on derivatives designated as cash flow hedges, net of tax [1] $ 61 $ (8) $ 214
[1] (5) Net of income tax expense of $16 million for the year ended Dec. 31, 2019 (2018 - $1 million recovery, 2017 - $77 million recovery).