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Risk Management Activities - Foreign Currency Rate Risk Management (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial Instruments [Abstract]      
Gains (losses) on derivatives designated as cash flow hedges, net of tax [1] $ (8) $ 214 $ 179
[1] (7) Net of income tax recovery of 1 million for the year ended Dec. 31, 2018 (2017 - 77 million recovery, 2016 - 92 million expense).