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Condensed Consolidated Balance Sheet Components - Summary of Other Current Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025
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Balance Sheet Related Disclosures [Abstract] |  |
Accrued research and development | $ 93 | $ 89
Accrued personnel expenses | 19 | 33
Income taxes payable | 1 | 1
Current portion of lease liabilities | 13 | 13
Other | 10 | 18
Total other current liabilities | $ 136 | $ 154

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