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Financing and Additional Notes and Loans Payable Information (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt-related interest [1] $ 138 $ 133 $ 103
Capitalized interest (48) (28) (38)
Net interest expense 90 105 65
Other interest 3 3 13
Total financing [2],[3] $ 93 $ 108 $ 78
[1] Includes related party interest with ExxonMobil.
[2] Amounts to related parties included in financing, (note 17). 98 89 60
[3] The weighted average interest rate on short-term borrowings in 2019 was 1.8 percent (2018 – 1.5 percent, 2017– 0.9 percent). Average effective rate on the long-term borrowings with ExxonMobil in 2019 was 2.2 percent (2018 – 2.0 percent, 2017 – 1.3 percent).