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Summary of Significant Accounting Policies - Schedule of Inventories (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Inventories, carrying amounts in excess of market value			$ 59,000,000	$ 0	$ 0
Finished goods		$ 133,000,000	133,000,000	177,000,000
Raw materials		83,000,000	83,000,000	112,000,000
In-process inventories		16,000,000	16,000,000	18,000,000
Parts and supplies		66,000,000	66,000,000	66,000,000
Total Inventories		298,000,000	298,000,000	373,000,000
Petroleum
Segment Reporting Information [Line Items]
Inventories, carrying amounts in excess of market value	$ 58,000,000	0		0
Nitrogen Fertilizer
Segment Reporting Information [Line Items]
Depreciation of inventories		$ 2,000,000	$ 2,000,000	$ 5,000,000

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