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Selected Balance Sheet Data Selected Balance Sheet Data, Accounts Receivable (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Accounts receivable	$ 1,119	$ 995
Less allowance for bad debts	(97)	(79)
Accounts receivable, net	$ 1,022	$ 916

X

- 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.

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