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Litigation, Environmental and Other Contingencies Litigation Other Contingency (Details)
$ in Millions
Dec. 31, 2018
CAD ($)
Government of Canada [Member] | Trans Mountain,Trans Mountain Expansion Project and Other Related Assets [Member] | Backstop [Member]  
Letters of Credit Outstanding, Amount $ 500
Commitments to Extend Credit [Member] | Trans Mountain and Trans Mountain Expansion Project [Member]  
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases $ 500