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Operating Information by Segment and Geographic Area - Other Segment Profit (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Operating income (Loss)	$ (378)	$ 463	$ 147
Reportable segments
Segment Reporting Information [Line Items]
Operating income (Loss)	(109)	635	537
Reportable segments | Other
Segment Reporting Information [Line Items]
Operating income (Loss)	$ 6	(78)	(228)
Reportable segments | Other | NuScale
Segment Reporting Information [Line Items]
Operating income (Loss)		(100)	(106)
Reportable segments | Other | Stork
Segment Reporting Information [Line Items]
Operating income (Loss)		23	(55)
Reportable segments | Other | AMECO
Segment Reporting Information [Line Items]
Operating income (Loss)		$ (1)	$ (67)

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