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Revenue (Condensed Consolidated Balance Sheet) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Condensed Consolidated Balance Sheet [Line Items]    
Receivables, gross $ 11,381 $ 11,456
Less: Allowance for doubtful accounts 546 352
Receivables, net 10,835 11,104
Noncurrent receivables, net (included in other noncurrent assets, net) 1,306 1,399
Contract acquisition and fulfillment costs (included in other noncurrent assets, net) 1,037 991
Noncurrent deferred revenue (included in other noncurrent liabilities) 888 650
NBCUniversal Media LLC [Member]    
Condensed Consolidated Balance Sheet [Line Items]    
Receivables, gross 7,304 7,392
Less: Allowance for doubtful accounts 110 99
Receivables, net 7,194 7,293
Noncurrent receivables, net (included in other noncurrent assets, net) 1,181 1,180
Noncurrent deferred revenue (included in other noncurrent liabilities) $ 657 $ 481