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Basis of Presentation (Recently Adopted Accounting Pronouncements Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Programming and other inventory $ 9,365   $ 8,652
Noncurrent Asset [Member] | Improvements to Accounting for Costs of Films and License Agreements for Program Materials [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Programming and other inventory   $ 1,170