Investments and Fair Value Measurement - Investments (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Marketable Securities [Line Items]
Marketable debt securities	$ 560	$ 1,180
Non-marketable equity securities:	592	6,576
Note receivable from a related party	81	83
Investments	13,774	9,052
Commercial paper
Marketable Securities [Line Items]
Marketable debt securities	233	457
U.S. government and agency securities
Marketable Securities [Line Items]
Marketable debt securities	235	429
Corporate bonds
Marketable Securities [Line Items]
Marketable debt securities	92	294
Didi
Marketable Securities [Line Items]
Non-marketable equity securities:	7,326	6,299
Aurora
Marketable Securities [Line Items]
Non-marketable equity securities:	2,148	0
Other
Marketable Securities [Line Items]
Non-marketable equity securities:	627	329
Grab
Marketable Securities [Line Items]
Non-marketable debt securities:	$ 3,592	$ 2,341

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