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Investments - Fair Values by Classification (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Consolidated Balance Sheets locations    
Marketable securities $ 4,381 $ 2,874
Total available-for-sale investments 9,845 8,234
Available-for-sale investments [Member]    
Consolidated Balance Sheets locations    
Cash and cash equivalents 5,464 5,360
Marketable securities 4,381 2,874
Total available-for-sale investments $ 9,845 $ 8,234