Investments and Fair Value Measurement - Investments (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Marketable Securities [Line Items]
Short-term investments	$ 894	$ 1,084
Restricted investments	7,371	7,019
Investments	8,746	8,460
Related Party
Marketable Securities [Line Items]
Note receivable from a related party	144	144
U.S. government and agency securities
Marketable Securities [Line Items]
Short-term investments	192	167
Restricted investments	5,920	5,552
Commercial paper
Marketable Securities [Line Items]
Short-term investments	121	220
Restricted investments	89	179
Corporate bonds
Marketable Securities [Line Items]
Short-term investments	535	659
Restricted investments	1,362	1,288
Certificates of deposit
Marketable Securities [Line Items]
Short-term investments	46	38
Didi
Marketable Securities [Line Items]
Non-marketable equity securities	2,757	2,602
Grab
Marketable Securities [Line Items]
Marketable equity securities	2,428	2,529
Aurora
Marketable Securities [Line Items]
Marketable equity securities	2,191	2,054
Other
Marketable Securities [Line Items]
Non-marketable equity securities	814	608
Marketable equity securities	$ 412	$ 523

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Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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