v3.10.0.1
Supplemental Financial Information (Cash Payments for Interest and Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash Payments for Interest and Income Taxes      
Interest $ 2,897 $ 2,820 $ 2,565
Income taxes 2,355 4,057 3,693
NBCUniversal Media LLC [Member]      
Cash Payments for Interest and Income Taxes      
Interest 408 517 548
Income taxes $ 430 $ 282 $ 208