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Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract]  
Schedule of Cash and Available-for-Sale Securities by Significant Investment Category
The following tables summarize our cash, cash equivalents, and available-for-sale securities by significant investment category as of March 31, 2026 and December 31, 2025 (in millions):
March 31, 2026
Amortized
Cost
Unrealized
Gains
Unrealized
Losses
Estimated Fair ValueCash and
Cash
Equivalents
Current
Marketable
Securities
Non-
Current
Marketable
Securities
Cash and cash equivalents$1,908 $— $— $1,908 $1,908 $— $— 
Available-for-sale:
Certificates of deposit61 — — 61 — 61 — 
U.S. treasury bills610 — — 610 — 610 — 
U.S. treasury notes2,230 (5)2,226 — 1,233 993 
Corporate debt securities2,599 (6)2,595 — 1,391 1,204 
Government debt securities56 — — 56 — 54 
Total$7,464 $$(11)$7,456 $1,908 $3,297 $2,251 
December 31, 2025
Amortized
Cost
Unrealized
Gains
Unrealized
Losses
Estimated Fair ValueCash and
Cash
Equivalents
Current
Marketable
Securities
Non-
Current
Marketable
Securities
Cash and cash equivalents$2,595 $— $— $2,595 $2,595 $— $— 
Available-for-sale:
Certificates of deposit91 — — 91 — 86 
U.S. treasury bills653 — — 653 — 653 — 
U.S. treasury notes2,188 (3)2,190 — 1,185 1,005 
Corporate debt securities2,535 (1)2,540 — 1,250 1,290 
Government debt securities66 — — 66 — 30 36 
Total$8,128 $11 $(4)$8,135 $2,595 $3,204 $2,336 
Schedule of Amortized Cost and Estimated Fair Value of Marketable Securities, by Contractual Maturity
The amortized cost and estimated fair value of available-for-sale securities by contractual maturity as of March 31, 2026 and December 31, 2025 were as follows (in millions):
March 31, 2026
Amortized
Cost
Estimated
Fair Value
Due in one year or less$3,297 $3,297 
Due after one year through five years2,259 2,251 
Total$5,556 $5,548 

December 31, 2025
Amortized
Cost
Estimated
Fair Value
Due in one year or less$3,199 $3,204 
Due after one year through five years2,334 2,336 
Total$5,533 $5,540 
Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value
The following table summarizes the amount of gross unrealized losses and the estimated fair value for our available-for-sale securities in an unrealized loss position by the length of time the securities have been in an unrealized loss position as of March 31, 2026 and December 31, 2025 (in millions):
Less than 12 Months12 Months or MoreTotal
Gross Unrealized LossesEstimated Fair ValueGross Unrealized LossesEstimated Fair ValueGross Unrealized LossesEstimated Fair Value
As of March 31, 2026:
U.S. treasury bills$— $1,023 $— $— $— $1,023 
U.S. treasury notes(3)960 (2)236 (5)1,196 
Corporate debt securities(6)1,562 — 35 (6)1,597 
Government debt securities— 56 — — — 56 
Total$(9)$3,601 $(2)$271 $(11)$3,872 
As of December 31, 2025:
U.S. treasury bills$— $111 $— $— $— $111 
U.S. treasury notes(1)176 (2)235 (3)411 
Corporate debt securities— 608 (1)40 (1)648 
Government debt securities— 36 — — 44 
Total$(1)$931 $(3)$283 $(4)$1,214 
Schedule of Financial Assets Measured at Fair Value on Recurring Basis
The following tables summarize our financial assets and liabilities measured at fair value on a recurring basis as of March 31, 2026 and December 31, 2025 (in millions):
Fair value at March 31, 2026Fair Value Measurement Using
Level 1Level 2
Assets:
Money market funds$595 $595 $— 
Certificates of deposit61 — 61 
U.S. treasury bills1,141 — 1,141 
U.S. treasury notes2,226 — 2,226 
Corporate debt securities2,978 — 2,978 
Government debt securities56 — 56 
Equity investments(1)
— 
Derivative instruments
— 
Total$7,067 $597 $6,470 

Fair value at December 31, 2025Fair Value Measurement Using
Level 1Level 2
Assets:
Money market funds$963 $963 $— 
Certificates of deposit91 — 91 
U.S. treasury bills1,445 — 1,445 
U.S. treasury notes2,190 — 2,190 
Corporate debt securities3,163 — 3,163 
Government debt securities66 — 66 
Equity Investments(1)
— 
Derivative instruments
— 
Total$7,925 $969 $6,956 
Liabilities:
Derivative instruments
$$— $
_______
(1)Investments in publicly traded equity securities with readily determinable fair values are recorded at quoted market prices for identical securities, with changes in fair value recorded in other expense, net, in our condensed consolidated statements of operations.