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Financial Instruments and Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2025
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 at December 31, 2025 and 2024 (in millions):
December 31, 2025
Amortized
Cost
Unrealized
Gains
Unrealized
Losses
Fair Value
Cash 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 
December 31, 2024
Amortized
Cost
Unrealized
Gains
Unrealized
Losses
Fair Value
Cash and
Cash
Equivalents
Current
Marketable
Securities
Non-
Current
Marketable
Securities
Cash and cash equivalents$1,927 $— $— $1,927 $1,927 $— $— 
Available-for-sale:
Certificates of deposit52 — — 52 — 52 — 
U.S. treasury bills786 — — 786 — 786 — 
U.S. treasury notes3,048 (15)3,036 — 1,958 1,078 
Corporate debt securities3,590 (13)3,580 — 2,172 1,408 
Government debt securities138 — — 138 — 130 
Total$9,541 $$(28)$9,519 $1,927 $5,098 $2,494 
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 at December 31, 2025 and 2024 were as follows (in millions):
December 31, 2025
Amortized
Cost
Estimated
Fair Value
Due in one year or less
$3,199 $3,204 
Due after one year through five years
2,334 2,336 
Total$5,533 $5,540 
December 31, 2024
Amortized
Cost
Estimated
Fair Value
Due in one year or less$5,106 $5,098 
Due after one year through five years2,508 2,494 
Total$7,614 $7,592 
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 length of time the securities have been in an unrealized loss position at December 31, 2025 and 2024 (in millions):
Less than 12 Months12 Months or MoreTotal
Gross Unrealized LossesEstimated Fair ValueGross Unrealized LossesEstimated Fair ValueGross Unrealized LossesEstimated Fair Value
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 
As of December 31, 2024:
U.S. treasury bills$— $101 $— $— $— $101 
U.S. treasury notes(2)729 (13)960 (15)1,689 
Corporate debt securities(4)843 (9)1,646 (13)2,489 
Government debt securities— — — 37 — 37 
Total$(6)$1,673 $(22)$2,643 $(28)$4,316 
Schedule of Financial Assets and Liabilities 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 December 31, 2025 and 2024 (in millions):
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
$$— $

Fair value at December 31, 2024Fair Value Measurement Using
Level 1Level 2
Assets:
Money market funds$1,195 $1,195 $— 
Certificates of deposit52 — 52 
U.S. treasury bills1,016 — 1,016 
U.S. treasury notes3,036 — 3,036 
Corporate debt securities3,763 — 3,763 
Government debt securities138 — 138 
Equity investments(1)
14 14 — 
Derivative instruments
10 — 10 
Total$9,224 $1,209 $8,015 
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 consolidated statements of operations.