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Revenue (Condensed Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Revenues [Abstract]
Receivables, gross	$ 11,841	$ 12,273
Less: Allowance for doubtful accounts	730	807
Receivables, net	11,110	11,466
Noncurrent receivables, net (included in other noncurrent assets, net)	1,091	1,091
Contract acquisition and fulfillment costs (included in other noncurrent assets, net)	1,022	1,060
Noncurrent deferred revenue (included in other noncurrent liabilities)	$ 719	$ 750

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