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Derivative Financial Instruments, Investments and Fair Value Measurements - Open Commodity Derivative Instruments (Details) - bbl bbl in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Crude oil |  |
Derivative [Line Items] |  |
Number of barrels | 1 | 0
Canadian crude oil |  |
Derivative [Line Items] |  |
Number of barrels | 4 | 5

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
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- Details
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- Details
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Balance Type: |
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