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Segment Information - Revenues and Intersegment Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Total intersegment revenues	$ (960)	$ (812)	$ (2,588)	$ (2,253)
Corporate & Eliminations
Segment Reporting Information [Line Items]
Total intersegment revenues	3	6	9	17
Corporate & Eliminations | ASC
Segment Reporting Information [Line Items]
Total intersegment revenues	3	6	9	17
Corporate & Eliminations | IMS
Segment Reporting Information [Line Items]
Total intersegment revenues	$ 0	$ 0	$ 0	$ 0

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