Segment (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) segment	Jun. 30, 2025 USD ($)
Segment Reporting [Abstract]
Number of reportable segments \| segment			1
Number of operating segments \| segment			1
Segment Reporting [Line Items]
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Net loss	(270)	(201)	(493)	(409)
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Segment Reporting [Line Items]
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