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Financial Instruments - Narrative (Details) - Oil | Dec. 31, 2018 liquefiedNaturalGasTons $ / barrel
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Derivative [Line Items] |
Derivative floor price (in usd per barrel) | $ / barrel | 60.00
Tons of liquefied natural gas | 1,000,000
Tons of liquefied natural gas linked to TTF index | 200,000

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