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Financial Instruments - Narrative (Details) - Oil
liquefiedNaturalGasTon in Thousands
Dec. 31, 2018
liquefiedNaturalGasTon
$ / barrel
Derivative [Line Items]  
Derivative floor price (in usd per barrel) | $ / barrel 60.00
Tons of liquefied natural gas 1,200
Tons of liquefied natural gas, capacity 1,440
Tons of liquefied natural gas linked to TTF index 200