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Investments (Schedule of Investments) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Equity method $ 5,347 $ 4,035
Marketable equity securities 353 341
Nonmarketable equity securities 1,896 1,805
Other investments 1,796 1,796
Total investments 9,392 7,977
Less: Current investments 1,709 94
Less: Investment securing collateralized obligation 694 0
Noncurrent investments 6,989 7,883
NBCUniversal Media LLC [Member]    
Schedule of Investments [Line Items]    
Equity method 1,156 707
Marketable equity securities 295 162
Nonmarketable equity securities 804 811
Total investments 2,255 1,680
Less: Current investments 1 0
Less: Investment securing collateralized obligation 694 0
Noncurrent investments $ 1,560 $ 1,680