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Related Party Transactions - Schedule of MGT to ATTM, Net Sales (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Net sales	$ 2,898	$ 3,074	$ 2,850
MGT
Related Party Transaction [Line Items]
Net sales	$ 54	$ 52	$ 47

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