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Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
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)
September 30, 2019
December 31, 2018
Long-term debt (including current maturities):
 
 
Fair value
$
10,420

$
9,639

Carrying value
8,983

8,696