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Investments (Schedule of Investments) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Investments [Abstract]    
Equity method $ 4,777 $ 5,347
Marketable equity securities 320 353
Nonmarketable equity securities 1,892 1,896
Other investments 1,794 1,796
Total investments 8,783 9,392
Less: Current investments 1,703 1,709
Less: Investment securing collateralized obligation 612 694
Noncurrent investments $ 6,468 $ 6,989