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Cash, Cash Equivalents, Restricted Cash and Investments - Schedule of Amortized Cost, Unrealized Gains and Losses and Fair Value of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 1,103	$ 1,011
Unrealized gains	0	1
Fair value	1,103	1,012
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	801	727
Unrealized gains	0	1
Fair value	801	728
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized cost	108	132
Unrealized gains	0	0
Fair value	108	132
Corporate bonds and notes
Debt Securities, Available-for-sale [Line Items]
Amortized cost	194	152
Unrealized gains	0	0
Fair value	$ 194	$ 152

X

- Definition

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).

+ References

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-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

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Amortized cost excluding accrued interest, before allowance for credit loss, of 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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-Section 45
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