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Condensed Consolidated Balance Sheet Components - Summary of Other Current Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]    
Accrued research and development $ 37 $ 36
Accrued personnel expenses 15 26
Current portion of lease liabilities 11 11
Other 1 3
Total other current liabilities $ 64 $ 76