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Revenue (Condensed Consolidated Balance Sheet) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Condensed Consolidated Balance Sheet [Line Items]    
Receivables, gross $ 11,161 $ 11,456
Less: Allowance for doubtful accounts 425 352
Receivables, net 10,736 11,104
Noncurrent receivables, net (included in other noncurrent assets, net) 1,379 1,399
Contract acquisition and fulfillment costs (included in other noncurrent assets, net) 1,001 991
Noncurrent deferred revenue (included in other noncurrent liabilities) 786 650
NBCUniversal Media LLC [Member]    
Condensed Consolidated Balance Sheet [Line Items]    
Receivables, gross 7,376 7,392
Less: Allowance for doubtful accounts 106 99
Receivables, net 7,270 7,293
Noncurrent receivables, net (included in other noncurrent assets, net) 1,185 1,180
Noncurrent deferred revenue (included in other noncurrent liabilities) $ 568 $ 481