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Investments (Schedule of Investments) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Investments [Abstract]    
Equity method $ 6,048 $ 6,006
Marketable equity securities 260 460
Nonmarketable equity securities 2,021 1,950
Other investments 130 143
Total investments 8,459 8,559
Less: Current investments 83 292
Less: Investment securing collateralized obligation 487 447
Noncurrent investments $ 7,889 $ 7,820