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Condensed Consolidated Balance Sheet Components (Tables)
 3 Months Ended
Mar. 31, 2024
Balance Sheet Related Disclosures [Abstract]  
Summary of Prepaid and Other Current Assets
Prepaid expenses and other current assets consisted of the following (in millions):
March 31, 2024December 31, 2023
Prepaid expenses and other assets$29 $30 
Accrued interest receivable5 4 
Total prepaid expenses and other current assets$34 $34 
Summary of Other Current Liabilities
Other current liabilities consisted of the following (in millions):
March 31, 2024December 31, 2023
Accrued research and development$37 $36 
Accrued personnel expenses15 26 
Current portion of lease liabilities11 11 
Other1 3 
Total other current liabilities$64 $76