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Segment (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
segment
Jun. 30, 2024
USD ($)
Segment Reporting [Abstract]        
Number of reportable segments | segment     1  
Segment Reporting Information [Line Items]        
Revenue $ 1 $ 0 $ 1 $ 0
Cost of revenue 5 0 5 0
Net loss (201) (182) (409) (347)
Reportable Segment        
Segment Reporting Information [Line Items]        
Revenue 1 0 1 0
Cost of revenue 5 0 5 0
Personnel expenses 112 108 227 212
Other operating expenses 59 52 121 105
Other segment items 26 22 57 30
Net loss $ (201) $ (182) $ (409) $ (347)