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Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 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)
June 30, 2018
December 31, 2017
Long-term debt (including current maturities):
 
 
Fair value
$
9,537

$
9,680

Carrying value
8,483

8,159