Financial Instruments and Fair Value Measurements - Financial Assets and Liabilities Measured At Fair Value On a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 8,135	$ 9,519
Certificates of deposit \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	91	52
U.S. treasury bills \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	653	786
U.S. treasury notes \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	2,190	3,036
Corporate debt securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	2,540	3,580
Government debt securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	66	138
Fair value recurring
Debt Securities, Available-for-sale [Line Items]
Derivative instruments	1	10
Total	$ 7,925	$ 9,224
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other current liabilities	Other current liabilities
Derivative instruments, liabilities	$ 4	$ 2
Fair value recurring \| Level 1
Debt Securities, Available-for-sale [Line Items]
Derivative instruments	0	0
Total	969	1,209
Derivative instruments, liabilities	0	0
Fair value recurring \| Level 2
Debt Securities, Available-for-sale [Line Items]
Derivative instruments	1	10
Total	6,956	8,015
Derivative instruments, liabilities	4	2
Fair value recurring \| Money market funds
Debt Securities, Available-for-sale [Line Items]
Fair Value	963	1,195
Fair value recurring \| Money market funds \| Level 1
Debt Securities, Available-for-sale [Line Items]
Fair Value	963	1,195
Fair value recurring \| Money market funds \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Fair value recurring \| Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Fair Value	91	52
Fair value recurring \| Certificates of deposit \| Level 1
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Fair value recurring \| Certificates of deposit \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	91	52
Fair value recurring \| U.S. treasury bills
Debt Securities, Available-for-sale [Line Items]
Fair Value	1,445	1,016
Fair value recurring \| U.S. treasury bills \| Level 1
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Fair value recurring \| U.S. treasury bills \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	1,445	1,016
Fair value recurring \| U.S. treasury notes
Debt Securities, Available-for-sale [Line Items]
Fair Value	2,190	3,036
Fair value recurring \| U.S. treasury notes \| Level 1
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Fair value recurring \| U.S. treasury notes \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	2,190	3,036
Fair value recurring \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	3,163	3,763
Fair value recurring \| Corporate debt securities \| Level 1
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Fair value recurring \| Corporate debt securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	3,163	3,763
Fair value recurring \| Government debt securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	66	138
Fair value recurring \| Government debt securities \| Level 1
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Fair value recurring \| Government debt securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	66	138
Fair value recurring \| Equity investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	6	14
Fair value recurring \| Equity investments \| Level 1
Debt Securities, Available-for-sale [Line Items]
Fair Value	6	14
Fair value recurring \| Equity investments \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 0	$ 0

Fair value portion of asset recognized for present right to economic benefit.

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