Financial Instruments - Schedule of Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 7,456	$ 8,135
Certificates of deposit \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	61	91
U.S. treasury bills \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	610	653
U.S. treasury notes \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	2,226	2,190
Corporate debt securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	2,595	2,540
Government debt securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	56	66
Fair Value, Recurring
Debt Securities, Available-for-sale [Line Items]
Derivative instruments	8	1
Total	7,067	7,925
Derivative instruments		4
Fair Value, Recurring \| Level 1
Debt Securities, Available-for-sale [Line Items]
Derivative instruments	0	0
Total	597	969
Derivative instruments		0
Fair Value, Recurring \| Level 2
Debt Securities, Available-for-sale [Line Items]
Derivative instruments	8	1
Total	6,470	6,956
Derivative instruments		4
Fair Value, Recurring \| Money market funds
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	595	963
Fair Value, Recurring \| Money market funds \| Level 1
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	595	963
Fair Value, Recurring \| Money market funds \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	0	0
Fair Value, Recurring \| Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	61	91
Fair Value, Recurring \| Certificates of deposit \| Level 1
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	0	0
Fair Value, Recurring \| Certificates of deposit \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	61	91
Fair Value, Recurring \| U.S. treasury bills
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	1,141	1,445
Fair Value, Recurring \| U.S. treasury bills \| Level 1
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	0	0
Fair Value, Recurring \| U.S. treasury bills \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	1,141	1,445
Fair Value, Recurring \| U.S. treasury notes
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	2,226	2,190
Fair Value, Recurring \| U.S. treasury notes \| Level 1
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	0	0
Fair Value, Recurring \| U.S. treasury notes \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	2,226	2,190
Fair Value, Recurring \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	2,978	3,163
Fair Value, Recurring \| Corporate debt securities \| Level 1
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	0	0
Fair Value, Recurring \| Corporate debt securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	2,978	3,163
Fair Value, Recurring \| Government debt securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	56	66
Fair Value, Recurring \| Government debt securities \| Level 1
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	0	0
Fair Value, Recurring \| Government debt securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	56	66
Fair Value, Recurring \| Equity investments
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	2	6
Fair Value, Recurring \| Equity investments \| Level 1
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	2	6
Fair Value, Recurring \| Equity investments \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 0	$ 0

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

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