Accounting Standards (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Accounting Standards Update and Change in Accounting Principle [Abstract]
Receivables, less allowance for doubtful accounts	$ 4,361	$ 7,479
Allowance for doubtful accounts	$ 18	$ 17

Amount, after 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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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