Revenue - Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Receivables, gross	$ 12,666	$ 12,273
Less: Allowance for doubtful accounts	658	807
Receivables, net	12,008	11,466
Noncurrent receivables, net (included in other noncurrent assets, net)	1,632	1,091
Contract acquisition and fulfillment costs (included in other noncurrent assets, net)	1,094	1,060
Noncurrent deferred revenue (included in other noncurrent liabilities)	$ 695	$ 750

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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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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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 noncurrent.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as noncurrent.

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