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Supplemental Financial Information (Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Supplemental Financial Information [Line Items]        
Cash and cash equivalents $ 5,726 $ 3,428    
Restricted cash included in other current assets 56 60    
Restricted cash included in other noncurrent assets, net 60 83    
Cash, cash equivalents and restricted cash, end of period 5,842 3,571 $ 2,822 $ 3,415
NBCUniversal Media LLC [Member]        
Supplemental Financial Information [Line Items]        
Cash and cash equivalents 1,283 2,347    
Restricted cash included in other noncurrent assets, net 31 30    
Cash, cash equivalents and restricted cash, end of period $ 1,314 $ 2,377 $ 1,866 $ 1,987