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Revenue (Condensed Consolidated Balance Sheet) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Condensed Consolidated Balance Sheet [Line Items]    
Receivables, gross $ 9,300 $ 9,122
Less: Allowance for doubtful accounts 317 288
Receivables, net 8,983 8,834
NBCUniversal Media LLC [Member]    
Condensed Consolidated Balance Sheet [Line Items]    
Receivables, gross 6,951 7,055
Less: Allowance for doubtful accounts 100 88
Receivables, net 6,851 6,967
Accounting Standards Update 2014-09 [Member]    
Condensed Consolidated Balance Sheet [Line Items]    
Noncurrent receivables, net (included in other noncurrent assets, net) 1,207 1,184
Contract acquisition and fulfillment costs (included in other noncurrent assets, net) 928 922
Noncurrent deferred revenue (included in other noncurrent liabilities) 572 497
Accounting Standards Update 2014-09 [Member] | NBCUniversal Media LLC [Member]    
Condensed Consolidated Balance Sheet [Line Items]    
Noncurrent receivables, net (included in other noncurrent assets, net) 1,098 1,093
Noncurrent deferred revenue (included in other noncurrent liabilities) $ 451 $ 392