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Revenue (Condensed Consolidated Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Condensed Consolidated Balance Sheet [Line Items]    
Receivables, gross $ 11,456 $ 9,122
Less: Allowance for doubtful accounts 352 288
Receivables, net 11,104 8,834
NBCUniversal Media LLC [Member]    
Condensed Consolidated Balance Sheet [Line Items]    
Receivables, gross 7,392 7,055
Less: Allowance for doubtful accounts 99 88
Receivables, net 7,293 6,967
Accounting Standards Update 2014-09 [Member]    
Condensed Consolidated Balance Sheet [Line Items]    
Noncurrent receivables (included in other noncurrent assets, net) 1,399 1,184
Contract acquisition and fulfillment costs (included in other noncurrent assets, net) 991 922
Noncurrent deferred revenue (included in other noncurrent liabilities) 650 497
Accounting Standards Update 2014-09 [Member] | NBCUniversal Media LLC [Member]    
Condensed Consolidated Balance Sheet [Line Items]    
Noncurrent receivables (included in other noncurrent assets, net) 1,180 1,093
Noncurrent deferred revenue (included in other noncurrent liabilities) $ 481 $ 392