Investments and Fair Value Measurement - Investments (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Marketable Securities [Line Items]
Short-term investments	$ 2,913	$ 727
Restricted investments	6,552	4,779
Investments	7,921	6,101
Related Party
Marketable Securities [Line Items]
Note receivable from a related party	131	126
U.S. government and agency securities
Marketable Securities [Line Items]
Short-term investments	628	253
Restricted investments	5,511	4,426
Commercial paper
Marketable Securities [Line Items]
Short-term investments	864	288
Restricted investments	173	17
Corporate bonds
Marketable Securities [Line Items]
Short-term investments	1,412	181
Restricted investments	805	77
Certificates of deposit
Marketable Securities [Line Items]
Short-term investments	9	5
Restricted investments	63	259
Didi
Marketable Securities [Line Items]
Non-marketable equity securities:	2,677	2,245
Grab
Marketable Securities [Line Items]
Marketable equity securities:	2,036	1,806
Aurora
Marketable Securities [Line Items]
Marketable equity securities:	1,930	1,425
Other
Marketable Securities [Line Items]
Non-marketable equity securities:	635	329
Marketable equity securities:	$ 512	$ 170

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