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Commitments and Contingencies (Summary of Future Minimum Rental Commitments for Operating Leases Under Previous Accounting Guidance and Rent Expense) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Operating Leased Assets [Line Items]  
2019 $ 891
2020 824
2021 722
2022 592
2023 513
Thereafter 2,608
NBCUniversal Media LLC [Member]  
Operating Leased Assets [Line Items]  
2019 248
2020 232
2021 199
2022 168
2023 144
Thereafter $ 1,380