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Property and Equipment
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and equipment
Property and equipment, net was all located in the U.S. and consisted of the following (in millions):
Useful Life
(in years)		As of December 31,
20242023
Leasehold improvements
5-10
$56 $54 
Scientific equipment527 24
Furniture and equipment
3-5
4 3
Construction in progress—1 1
Property and equipment, gross88 82
Less: Accumulated depreciation and amortization(41)(31)
Property and equipment, net$47 $51