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Investments and Fair Value Measurement - Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Marketable Securities [Line Items]    
Marketable debt securities $ 0 $ 1,180
Marketable equity securities 1,386 0
Note receivable from a related party 81 83
Investments 12,239 9,052
Commercial paper    
Marketable Securities [Line Items]    
Marketable debt securities 0 457
U.S. government and agency securities    
Marketable Securities [Line Items]    
Marketable debt securities 0 429
Corporate bonds    
Marketable Securities [Line Items]    
Marketable debt securities 0 294
Didi    
Marketable Securities [Line Items]    
Non-marketable equity securities: 4,126 6,299
Aurora    
Marketable Securities [Line Items]    
Non-marketable equity securities: 2,250 0
Other    
Marketable Securities [Line Items]    
Non-marketable equity securities: 307 329
Grab    
Marketable Securities [Line Items]    
Non-marketable debt securities: $ 4,089 $ 2,341