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Investments and Fair Value Measurement (Tables)
 12 Months Ended
Dec. 31, 2024
Fair Value Disclosures [Abstract]  
Summary of Investments
Our investments on the consolidated balance sheets consisted of the following as of December 31, 2023 and 2024 (in millions):
As of December 31,
20232024
Classified as short-term investments:
Marketable debt securities (1):
U.S. government and agency securities$253 $167 
Commercial paper288 220 
Corporate bonds181 659 
Certificates of deposit5 38 
Short-term investments$727 $1,084 
Classified as restricted investments:
Marketable debt securities (1):
U.S. government and agency securities$4,426 $5,552 
Commercial paper17 179 
Corporate bonds77 1,288 
Certificates of deposit259 — 
Restricted investments$4,779 $7,019 
Classified as investments:
Non-marketable equity securities:
Didi$2,245 $2,602 
Other (2)
329 608 
Marketable equity securities:
Grab1,806 2,529 
Aurora (3)
1,425 2,054 
Other170 523 
Notes receivable from a related party (2), (4)
126 144 
Investments$6,101 $8,460 
(1) Excluding marketable debt securities classified as cash equivalents and restricted cash equivalents.
(2) These balances include certain investments recorded at fair value with changes in fair value recorded in earnings due to the election of the fair value option of accounting for financial instruments.
(3) In connection with Aurora Innovation, Inc.’s (“Aurora”) November 2021 initial public offering, we are subject to a lock-up agreement in which our ability to sell or transfer our shares in Aurora is partially restricted until November 2025.
(4) Consists of the Lime Convertible Note. Neutron Holdings, Inc. (“Lime”) is considered a related party as a result of our investment in Lime Common Stock.
Schedule of Assets Measured on Recurring Basis
The following table presents our financial assets measured at fair value on a recurring basis based on the three-tier fair value hierarchy (in millions):
As of December 31, 2023As of December 31, 2024
Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Financial Assets
Money market funds$1,153 $— $— $1,153 $1,868 $— $— $1,868 
U.S. government and agency securities— 4,840 — 4,840 — 5,848 — 5,848 
Commercial paper— 351 — 351 — 702 — 702 
Corporate bonds— 263 — 263 — 1,974 — 1,974 
Certificates of deposit— 266 — 266 — 38 — 38 
Non-marketable equity securities— — — — — — 11 11 
Marketable equity securities3,401 — — 3,401 5,106 — — 5,106 
Notes receivable from a related party— — 126 126 — — 144 144 
Total financial assets$4,554 $5,720 $126 $10,400 $6,974 $8,562 $155 $15,691 
Summary of Amortized Cost, Unrealized Gains and Losses and Fair Value of Debt Securities
The following table summarizes the amortized cost, unrealized gains and losses, and fair value of our debt securities (in millions):
 As of December 31, 2024
 Amortized CostUnrealized GainsUnrealized LossesFair Value
U.S. government and agency securities$5,843 $7 $(2)$5,848 
Commercial paper702 — — 702 
Corporate bonds1,975 1 (2)1,974 
Certificates of deposit38 — — 38 
Total$8,558 $8 $(4)$8,562 
Schedule of Reconciliation Using Significant Unobservable Inputs, Assets
The following table presents a reconciliation of our financial assets and liabilities measured and recorded at fair value on a recurring basis as of December 31, 2023 and 2024, using significant unobservable inputs (Level 3) (in millions):
Non-marketable
Equity Securities		Notes ReceivableMLU B.V. Call Option
Balance as of December 31, 2022$3 $110 $2 
Change in fair value
Included in earnings(3)16 (2)
Balance as of December 31, 2023— 126 — 
Change in fair value
Included in earnings11 18 — 
Balance as of December 31, 2024$11 $144 $— 
Schedule of Reconciliation Using Significant Unobservable Inputs, Liabilities
The following table presents a reconciliation of our financial assets and liabilities measured and recorded at fair value on a recurring basis as of December 31, 2023 and 2024, using significant unobservable inputs (Level 3) (in millions):
Non-marketable
Equity Securities		Notes ReceivableMLU B.V. Call Option
Balance as of December 31, 2022$3 $110 $2 
Change in fair value
Included in earnings(3)16 (2)
Balance as of December 31, 2023— 126 — 
Change in fair value
Included in earnings11 18 — 
Balance as of December 31, 2024$11 $144 $— 
Schedule of Securities without Readily Determinable Fair Value
The following is a summary of unrealized gains and losses from remeasurement (referred to as upward or downward adjustments) recorded in other income (expense), net in the consolidated statements of operations, and included as adjustments to the carrying value of non-marketable equity securities held during the years ended December 31, 2022, 2023 and 2024 based on the observable price in an orderly transaction for the same or similar security of the same issuers (in millions):
Year Ended December 31,
202220232024
Upward adjustments$1,046 $908 $657 
Downward adjustments (including impairment)(641)(472)(328)
Total unrealized gain (loss) for non-marketable equity securities$405 $436 $329 
The following table summarizes the total carrying value of our non-marketable equity securities measured at fair value on a non-recurring basis held, including cumulative unrealized upward and downward adjustments made to the initial cost basis of the securities (in millions):
As of December 31,
20232024
Initial cost basis$1,727 $2,030 
Upward adjustments1,960 2,611 
Downward adjustments (including impairment)(1,113)(1,442)
Total carrying value at the end of the period$2,574 $3,199