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Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Receivables
Receivables	$ 4,854	$ 8,094
Allowance for credit losses	(47)	(36)
Receivables after allowance for credit losses	4,807	8,058
Income taxes receivable	1,024	84
Other receivables	278	846
Receivables, net	6,109	8,988
Receivables from Contracts with Customers [Member]
Receivables
Receivables	3,642	5,610
Receivables from Certain Purchase and Sale Arrangements [Member]
Receivables
Receivables	$ 1,212	$ 2,484

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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