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Consolidated Balance Sheet Components
 12 Months Ended
Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]  
Consolidated Balance Sheet Components Consolidated balance sheet components
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following (in millions):
As of December 31,
20232022
Prepaid expenses and other assets$30 $15 
Accrued interest receivable4 4 
Total prepaid expenses and other current assets$34 $19 
Other Current Liabilities
Other current liabilities consisted of the following (in millions):
As of December 31,
20232022
Accrued research and development$36 $45 
Accrued personnel expenses26 25 
Current portion of lease liabilities11 3 
Other3 3 
Total other current liabilities$76 $76