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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 960	$ 812	$ 2,588	$ 2,253
Intersegment Sales
Disaggregation of Revenue [Line Items]
Revenues	(3)	(6)	(9)	(17)
ASC | Firm-Fixed Price
Disaggregation of Revenue [Line Items]
Revenues	509	446	1,414	1,198
ASC | Flexibly Priced
Disaggregation of Revenue [Line Items]
Revenues	68	81	210	243
ASC | Prime contractor
Disaggregation of Revenue [Line Items]
Revenues	298	200	760	616
ASC | Subcontractor
Disaggregation of Revenue [Line Items]
Revenues	279	327	864	825
ASC | Intersegment Sales
Disaggregation of Revenue [Line Items]
Revenues	(3)	(6)	(9)	(17)
ASC | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	580	533	1,633	1,458
ASC | United States
Disaggregation of Revenue [Line Items]
Revenues	500	426	1,411	1,159
ASC | International
Disaggregation of Revenue [Line Items]
Revenues	77	101	213	282
IMS | Firm-Fixed Price
Disaggregation of Revenue [Line Items]
Revenues	359	238	855	670
IMS | Flexibly Priced
Disaggregation of Revenue [Line Items]
Revenues	24	47	109	142
IMS | Prime contractor
Disaggregation of Revenue [Line Items]
Revenues	136	58	236	182
IMS | Subcontractor
Disaggregation of Revenue [Line Items]
Revenues	247	227	728	630
IMS | Intersegment Sales
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
IMS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	383	285	964	812
IMS | United States
Disaggregation of Revenue [Line Items]
Revenues	366	277	956	796
IMS | International
Disaggregation of Revenue [Line Items]
Revenues	$ 17	$ 8	$ 8	$ 16

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