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Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Cash and Available-for-Sale Securities by Significant Investment Category
The following tables summarize our cash and available-for-sale securities by significant investment category at March 31, 2023 and December 31, 2022 (in millions):
March 31, 2023
Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Estimated Fair ValueCash and
Cash
Equivalents		Current
Marketable
Securities		Non-
Current
Marketable
Securities
Cash and cash equivalents$3,441 $— $— $3,441 $3,441 $— $— 
Available-for-sale:
Certificates of deposit47 — — 47 — 47 — 
U.S. treasury bills30 — — 30 — 30 — 
U.S. treasury notes6,958 5 (156)6,807 — 3,864 2,943 
Corporate debt securities6,074 2 (184)5,892 — 1,533 4,359 
Government debt securities156 — (8)148 — 8 140 
Total$16,706 $7 $(348)$16,365 $3,441 $5,482 $7,442 
December 31, 2022
Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Estimated Fair ValueCash and
Cash
Equivalents		Current
Marketable
Securities		Non-
Current
Marketable
Securities
Cash and cash equivalents$3,205 $— $— $3,205 $3,205 $— $— 
Available-for-sale:
Certificates of deposit188 — — 188 — 188 — 
U.S. treasury bills767 — — 767 — 767 — 
U.S. treasury notes7,781 — (229)7,552 — 4,182 3,370 
Corporate debt securities6,595 — (226)6,369 — 1,560 4,809 
Government debt securities148 — (9)139 — — 139 
Total$18,684 $— $(464)$18,220 $3,205 $6,697 $8,318 
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 March 31, 2023 and December 31, 2022 were as follows (in millions):
March 31, 2023
Amortized
Cost		Estimated
Fair Value
Due in one year or less$5,575 $5,482 
Due after one year through five years7,690 7,442 
Total$13,265 $12,924 

December 31, 2022
Amortized
Cost		Estimated
Fair Value
Due in one year or less$6,792 $6,697 
Due after one year through five years8,687 8,318 
Total$15,479 $15,015 
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value
The following table summarizes the amount of gross unrealized losses and the estimated fair value for our available-for-sale securities in an unrealized loss position by the length of time the securities have been in an unrealized loss position at March 31, 2023 and December 31, 2022 (in millions):
Less than 12 Months12 Months or MoreTotal
Gross Unrealized LossesEstimated Fair ValueGross Unrealized LossesEstimated Fair ValueGross Unrealized LossesEstimated Fair Value
As of March 31, 2023:
U.S. treasury bills$— $— $— $— $— $— 
U.S. treasury notes(25)1,783 (131)4,063 (156)5,846 
Corporate debt securities(33)1,593 (151)3,537 (184)5,130 
Government debt securities(1)38 (7)102 (8)140 
Total$(59)$3,414 $(289)$7,702 $(348)$11,116 
As of December 31, 2022:
U.S. treasury bills$— $128 $— $— $— $128 
U.S. treasury notes(101)3,956 (128)3,541 (229)7,497 
Corporate debt securities(138)3,505 (88)1,890 (226)5,395 
Government debt securities(2)46 (7)93 (9)139 
Total$(241)$7,635 $(223)$5,524 $(464)$13,159 
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, 2023 and December 31, 2022 (in millions):
Fair value at March 31, 2023Fair Value Measurement Using
Level 1Level 2
Assets:
Money market funds$3,067 $3,067 $— 
Certificates of deposit47 — 47 
U.S. treasury bills30 — 30 
U.S. treasury notes6,807 — 6,807 
Corporate debt securities6,024 — 6,024 
Government debt securities148 — 148 
Equity investments(1)
41 41 — 
Derivative instruments (Note 8)
7 — 7 
Total$16,171 $3,108 $13,063 
Liabilities:
Derivative instruments (Note 8)
$11 $— $11 

Fair value at December 31, 2022Fair Value Measurement Using
Level 1Level 2
Assets:
Money market funds$1,079 $1,079 $— 
Certificates of deposit188 — 188 
U.S. treasury bills767 — 767 
U.S. treasury notes7,552 — 7,552 
Corporate debt securities6,369 — 6,369 
Government debt securities139 — 139 
Derivative instruments (Note 8)
6 — 6 
Total$16,100 $1,079 $15,021 
Liabilities:
Derivative instruments (Note 8)
$32 $— $32 
_______
(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.