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Cash, Cash Equivalents, Restricted Cash and Investments - Schedule of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 1,082	$ 1,237
Unrealized losses	(1)
Unrealized gains		1
Fair value	1,081	1,238
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	642	765
Unrealized losses	(1)
Unrealized gains		1
Fair value	641	766
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized cost	0	39
Unrealized losses	0
Unrealized gains		0
Fair value	0	39
Corporate bonds and notes
Debt Securities, Available-for-sale [Line Items]
Amortized cost	440	433
Unrealized losses	0
Unrealized gains		0
Fair value	$ 440	$ 433

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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