Segment Information - Revenues, Expenses, and Operating Earnings by Segment and Reconciliation to Earnings before Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Total revenues	$ 799	$ 688
Total cost of revenues	618	535
Total general and administrative	89	81
Total company-funded research and development	28	20
Total amortization of intangibles	5	5
Total other segment items	0	4
Total operating earnings	59	43
Interest expense	(1)	(5)
Other, net	0	(1)
Earnings before taxes	58	37
Operating Segments | ASC
Segment Reporting Information [Line Items]
Total revenues	511	433
Total cost of revenues	392	329
Total general and administrative	66	60
Total company-funded research and development	23	16
Total amortization of intangibles	5	5
Total other segment items	0	4
Total operating earnings	25	19
Operating Segments | IMS
Segment Reporting Information [Line Items]
Total revenues	291	261
Total cost of revenues	229	212
Total general and administrative	23	20
Total company-funded research and development	5	4
Total amortization of intangibles	0	0
Total other segment items	0	0
Total operating earnings	34	25
Corporate & Eliminations
Segment Reporting Information [Line Items]
Total revenues	(3)	(6)
Total cost of revenues	(3)	(6)
Total general and administrative	0	1
Total company-funded research and development	0	0
Total amortization of intangibles	0	0
Total other segment items	0	0
Total operating earnings	$ 0	$ (1)