v3.10.0.1
Long-Term Debt (Debt Maturities) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]  
2019 $ 4,413
2020 7,961
2021 11,548
2022 8,741
2023 7,818
Thereafter 72,964
NBCUniversal Media LLC [Member]  
Long-term Debt, Fiscal Year Maturity [Abstract]  
2019 153
2020 2,280
2021 2,365
2022 2,922
2023 1,012
Thereafter $ 4,186