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Revenue (Condensed Consolidated Balance Sheet) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Condensed Consolidated Balance Sheet [Line Items] |  |
Receivables, gross | $ 11,711 | $ 11,456
Less: Allowance for doubtful accounts | 419 | 352
Receivables, net | 11,292 | 11,104
Noncurrent receivables (included in other noncurrent assets, net) | 1,337 | 1,399
Contract acquisition and fulfillment costs (included in other noncurrent assets, net) | 1,083 | 991
Noncurrent deferred revenue (included in other noncurrent liabilities) | 618 | 650
NBCUniversal Media LLC [Member] |  |
Condensed Consolidated Balance Sheet [Line Items] |  |
Receivables, gross | 7,336 | 7,392
Less: Allowance for doubtful accounts | 100 | 99
Receivables, net | 7,236 | 7,293
Noncurrent receivables (included in other noncurrent assets, net) | 1,146 | 1,180
Noncurrent deferred revenue (included in other noncurrent liabilities) | $ 394 | $ 481

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