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Condensed Consolidated Balance Sheet Components - Summary of Other Current Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Balance Sheet Related Disclosures [Abstract]    
Accrued research and development $ 84 $ 65
Accrued personnel expenses 28 31
Current portion of lease liabilities 13 12
Other 16 15
Total other current liabilities $ 141 $ 123