Derivative Instruments and Hedging Activities- Location of Gain Loss in Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Commodity contracts									$ (4,871)	$ (5,349)	$ 11,221
Sales and other revenues	$ 2,900,768	$ 2,819,400	$ 2,062,930	$ 3,400,545	$ 4,381,888	$ 4,424,828	$ 4,782,615	$ 3,897,247	11,183,643	17,486,578	17,714,666
Cost of products sold									9,158,805	13,918,384	13,940,782
Operating expenses									1,300,277	1,394,052	1,285,838
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Commodity contracts									(4,871)	(5,349)	11,221
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Total reclassified into earnings									(2,604)	19,713	(6,055)
Reclassification out of Accumulated Other Comprehensive Income | Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Sales and other revenues									(5,168)	(1,799)	(5,093)
Cost of products sold									4,281	22,876	0
Operating expenses									$ (1,717)	$ (1,364)	$ (962)