Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 02, 2024	Aug. 04, 2023	Aug. 02, 2024	Aug. 04, 2023
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,818	$ 1,784	$ 3,665	$ 3,812
Prime Contractor [Member]
Disaggregation of Revenue [Line Items]
Total revenues	1,618	1,591	3,269	3,446
Subcontractor [Member]
Disaggregation of Revenue [Line Items]
Total revenues	156	156	315	292
Other Contractor [Member]
Disaggregation of Revenue [Line Items]
Total revenues	44	37	81	74
Defense And Intelligence
Disaggregation of Revenue [Line Items]
Total revenues	1,415	1,389	2,851	2,986
Defense And Intelligence \| Prime Contractor [Member]
Disaggregation of Revenue [Line Items]
Total revenues	1,283	1,261	2,592	2,750
Defense And Intelligence \| Subcontractor [Member]
Disaggregation of Revenue [Line Items]
Total revenues	122	125	245	229
Defense And Intelligence \| Other Contractor [Member]
Disaggregation of Revenue [Line Items]
Total revenues	10	3	14	7
Civilian
Disaggregation of Revenue [Line Items]
Total revenues	403	395	814	826
Civilian \| Prime Contractor [Member]
Disaggregation of Revenue [Line Items]
Total revenues	335	330	677	696
Civilian \| Subcontractor [Member]
Disaggregation of Revenue [Line Items]
Total revenues	34	31	70	63
Civilian \| Other Contractor [Member]
Disaggregation of Revenue [Line Items]
Total revenues	34	34	67	67
Cost Reimbursement Contract [Member]
Disaggregation of Revenue [Line Items]
Total revenues	1,105	1,105	2,260	2,217
Cost Reimbursement Contract [Member] \| Defense And Intelligence
Disaggregation of Revenue [Line Items]
Total revenues	1,085	1,092	2,219	2,183
Cost Reimbursement Contract [Member] \| Civilian
Disaggregation of Revenue [Line Items]
Total revenues	20	13	41	34
Time-and-Materials Contract [Member]
Disaggregation of Revenue [Line Items]
Total revenues	426	358	843	725
Time-and-Materials Contract [Member] \| Defense And Intelligence
Disaggregation of Revenue [Line Items]
Total revenues	162	115	311	229
Time-and-Materials Contract [Member] \| Civilian
Disaggregation of Revenue [Line Items]
Total revenues	264	243	532	496
Fixed-Price Contract [Member]
Disaggregation of Revenue [Line Items]
Total revenues	287	321	562	870
Fixed-Price Contract [Member] \| Defense And Intelligence
Disaggregation of Revenue [Line Items]
Total revenues	168	182	321	574
Fixed-Price Contract [Member] \| Civilian
Disaggregation of Revenue [Line Items]
Total revenues	119	139	241	296
Department of Defense
Disaggregation of Revenue [Line Items]
Total revenues	950	919	1,926	1,990
Department of Defense \| Defense And Intelligence
Disaggregation of Revenue [Line Items]
Total revenues	950	917	1,924	1,986
Department of Defense \| Civilian
Disaggregation of Revenue [Line Items]
Total revenues	0	2	2	4
Intelligence and other federal government agencies
Disaggregation of Revenue [Line Items]
Total revenues	824	828	1,658	1,748
Intelligence and other federal government agencies \| Defense And Intelligence
Disaggregation of Revenue [Line Items]
Total revenues	455	469	913	993
Intelligence and other federal government agencies \| Civilian
Disaggregation of Revenue [Line Items]
Total revenues	369	359	745	755
Commercial, state and local governments and international
Disaggregation of Revenue [Line Items]
Total revenues	44	37	81	74
Commercial, state and local governments and international \| Defense And Intelligence
Disaggregation of Revenue [Line Items]
Total revenues	10	3	14	7
Commercial, state and local governments and international \| Civilian
Disaggregation of Revenue [Line Items]
Total revenues	$ 34	$ 34	$ 67	$ 67