Segment Information - Revenues, Expenses, and Operating Earnings by Segment and Reconciliation to Earnings before Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Total revenues	$ 829	$ 753	$ 1,628	$ 1,441
Total cost of revenues	632	584	1,250	1,119
Total general and administrative	91	86	180	167
Total company-funded research and development	30	21	58	41
Total amortization of intangibles	6	6	11	11
Total other segment items	0	1	0	5
Total operating earnings	70	55	129	98
Interest expense, net	(2)	(7)	(3)	(12)
Other, net	(1)	(1)	(1)	(2)
Earnings before taxes	67	47	125	84
Operating Segments | ASC
Segment Reporting Information [Line Items]
Total revenues	542	492	1,053	925
Total cost of revenues	408	371	800	700
Total general and administrative	67	61	133	121
Total company-funded research and development	24	16	47	32
Total amortization of intangibles	6	6	11	11
Total other segment items	0	1	0	5
Total operating earnings	37	37	62	56
Operating Segments | IMS
Segment Reporting Information [Line Items]
Total revenues	290	266	581	527
Total cost of revenues	227	218	456	430
Total general and administrative	24	22	47	42
Total company-funded research and development	6	5	11	9
Total amortization of intangibles	0	0	0	0
Total other segment items	0	0	0	0
Total operating earnings	33	21	67	46
Corporate & Eliminations
Segment Reporting Information [Line Items]
Total revenues	(3)	(5)	(6)	(11)
Total cost of revenues	(3)	(5)	(6)	(11)
Total general and administrative	0	3	0	4
Total company-funded research and development	0	0	0	0
Total amortization of intangibles	0	0	0	0
Total other segment items	0	0	0	0
Total operating earnings	$ 0	$ (3)	$ 0	$ (4)