Credit Losses (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Credit Losses
Accounts receivable, net	$ 793	$ 623	$ 724
Allowance for doubtful accounts	$ 31	$ 33	$ 33

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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