Segment Information - Revenues and Intersegment Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Revenue	$ 569	$ 612
Operating Segments | ASC
Segment Reporting Information [Line Items]
Revenue	391	396
Operating Segments | IMS
Segment Reporting Information [Line Items]
Revenue	189	218
Corporate & Eliminations
Segment Reporting Information [Line Items]
Revenue	(11)	(2)
Corporate & Eliminations | ASC
Segment Reporting Information [Line Items]
Revenue	11	2
Corporate & Eliminations | IMS
Segment Reporting Information [Line Items]
Revenue	$ 0	$ 0