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Investments and Fair Value Measurement - Investments (Details) - USD ($) shares in Millions, $ in Millions		12 Months Ended
	Aug. 01, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Marketable Securities [Line Items]
Short-term investments		$ 440	$ 0
Non-marketable equity securities:		8,059	7,985
Investments		10,527	10,355
Value of shares acquired		0	2,275	$ 0
Uber China
Marketable Securities [Line Items]
Shares acquired (in shares)	52
Value of shares acquired	$ 6,000
Commercial paper
Marketable Securities [Line Items]
Short-term investments		148	0
U.S. government and agency securities
Marketable Securities [Line Items]
Short-term investments		93	0
Corporate bonds
Marketable Securities [Line Items]
Short-term investments		199	0
Didi
Marketable Securities [Line Items]
Non-marketable equity securities:		7,953	7,953
Other
Marketable Securities [Line Items]
Non-marketable equity securities:		204	32
Grab
Marketable Securities [Line Items]
Non-marketable debt securities		2,336	2,328
Other
Marketable Securities [Line Items]
Non-marketable debt securities		$ 34	$ 42