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Segment Information - Total Assets by Segment (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Total assets	$ 4,245	$ 4,184
Operating Segments | ASC
Segment Reporting Information [Line Items]
Total assets	2,465	2,249
Operating Segments | IMS
Segment Reporting Information [Line Items]
Total assets	1,344	1,225
Corporate & Eliminations
Segment Reporting Information [Line Items]
Total assets	$ 436	$ 710

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