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Inventories (Details) - USD ($)	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Inventory Disclosure [Abstract]
Finished goods			$ 110,000,000	$ 110,000,000		$ 177,000,000
Raw materials			73,000,000	73,000,000		112,000,000
In-process inventories			17,000,000	17,000,000		18,000,000
Parts, supplies and other			66,000,000	66,000,000		66,000,000
Total inventories			266,000,000	266,000,000		373,000,000
Inventory [Line Items]
Inventories, carrying amounts in excess of market value				$ 59,000,000	$ 0
Petroleum
Inventory [Line Items]
Inventories, carrying amounts in excess of market value	$ 0	$ 58,000,000	$ 0			$ 0

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date for elements of machinery or equipment held for the purpose of replacing similar parts in the course of repair or maintenance.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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