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Accounts Receivable Net (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable Net Current [Abstract]
Accounts receivable	$ 875	$ 834
Allowance for doubtful accounts	(12)	(17)
Accounts receivable – net	$ 863	$ 817

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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Amount of allowance for credit loss on accounts receivable, classified as current.

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