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Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Fair Value and Carrying Value of Long-term Debt
The carrying values of financial instruments equal or approximate their fair values with the exception of long-term debt:
(in millions of Canadian dollars)
December 31, 2018

December 31, 2017

Long-term debt (including current maturities):
 
 
Fair value
$
9,639

$
9,680

Carrying value
8,696

8,159