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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)

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