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Consolidated Balance Sheet Components (Tables)
 12 Months Ended
Dec. 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):
As of December 31,
20242023
Prepaid expenses and other assets$13 $30 
Accrued interest receivable5 4 
Total prepaid expenses and other current assets$18 $34 
Summary of Other Current Liabilities
Other current liabilities consisted of the following (in millions):
As of December 31,
20242023
Accrued research and development$65 $36 
Accrued personnel expenses31 26 
Income taxes payable
1 — 
Current portion of lease liabilities12 11 
Other14 3 
Total other current liabilities$123 $76