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Inventories (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 61		$ 112
In-process inventories	10		18
Finished goods	77		177
Parts, supplies and other	63		66
Total inventories	211		373
Inventory [Line Items]
Inventories, market value in excess of carrying amount	58	$ 0
Petroleum
Inventory [Line Items]
Inventories, market value in excess of carrying amount	$ 58		$ 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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