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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