Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 2,693	$ 2,879	$ 2,778
Intersegment Sales
Disaggregation of Revenue [Line Items]
Revenue	(23)	(20)	(14)
ASC | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	918	1,209	1,063
ASC | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	794	712	882
ASC | Firm Fixed Price
Disaggregation of Revenue [Line Items]
Revenue	1,494	1,667	1,716
ASC | Flexibly Priced
Disaggregation of Revenue [Line Items]
Revenue	218	254	229
ASC | Intersegment Sales
Disaggregation of Revenue [Line Items]
Revenue	21	19	13
ASC | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,733	1,940	1,958
IMS | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	186	174	283
IMS | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	795	784	550
IMS | Firm Fixed Price
Disaggregation of Revenue [Line Items]
Revenue	853	831	692
IMS | Flexibly Priced
Disaggregation of Revenue [Line Items]
Revenue	128	127	141
IMS | Intersegment Sales
Disaggregation of Revenue [Line Items]
Revenue	2	1	1
IMS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	983	959	834
United States | ASC
Disaggregation of Revenue [Line Items]
Revenue	1,543	1,808	1,763
United States | IMS
Disaggregation of Revenue [Line Items]
Revenue	956	913	792
International | ASC
Disaggregation of Revenue [Line Items]
Revenue	169	113	182
International | IMS
Disaggregation of Revenue [Line Items]
Revenue	$ 25	$ 45	$ 41