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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

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