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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

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