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Financial and derivative instruments (Tables) | 12 Months Ended
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Dec. 31, 2019
Summary of Realized and Unrealized Gain or (Loss) on Derivative Instruments | Realized and unrealized gain or (loss) on derivative instruments recognized in the Consolidated statement of income is included in the following lines on a before-tax basis:
millions of Canadian dollars |  | 2019 |  |  | 2018 |  |  | 2017 |
Revenues |  |  | (3 | ) |  |  | 6 |  |  |  | - |
Purchases of crude oil and products |  |  | (7 | ) |  |  | (24 | ) |  |  | (5 | )
Total |  |  | (10 | ) |  |  | (18 | ) |  |  | (5 | )

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- Definition Realized And Unrealized Gains Losses On Derivative Instruments Table [Text Block] + References No definition available. + Details
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