BUSINESS SEGMENT INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2026	Jun. 27, 2025	Jul. 03, 2026	Jun. 27, 2025
Disaggregation of Revenue [Line Items]
Revenue	$ 5,881	$ 5,426	$ 11,625	$ 10,558
Intersegment
Disaggregation of Revenue [Line Items]
Revenue	(82)	(130)	(173)	(204)
Total segment
Disaggregation of Revenue [Line Items]
Revenue	5,881	5,426	11,625	10,412
Space & Mission Systems \| United States
Disaggregation of Revenue [Line Items]
Revenue	2,505	2,380	5,045	4,408
Space & Mission Systems \| International
Disaggregation of Revenue [Line Items]
Revenue	439	362	866	719
Space & Mission Systems \| Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	2,138	1,957	4,048	3,615
Space & Mission Systems \| Cost-type
Disaggregation of Revenue [Line Items]
Revenue	806	785	1,863	1,512
Space & Mission Systems \| Intersegment
Disaggregation of Revenue [Line Items]
Revenue	(22)	(28)	(45)	(54)
Space & Mission Systems \| Total segment
Disaggregation of Revenue [Line Items]
Revenue	2,966	2,770	5,956	5,181
CSD \| United States
Disaggregation of Revenue [Line Items]
Revenue	1,076	1,113	2,113	2,204
CSD \| International
Disaggregation of Revenue [Line Items]
Revenue	819	654	1,580	1,343
CSD \| Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	1,585	1,518	3,105	3,011
CSD \| Cost-type
Disaggregation of Revenue [Line Items]
Revenue	310	249	588	536
CSD \| Intersegment
Disaggregation of Revenue [Line Items]
Revenue	(48)	(94)	(105)	(123)
CSD \| Total segment
Disaggregation of Revenue [Line Items]
Revenue	1,943	1,861	3,798	3,670
Missile Solutions \| United States
Disaggregation of Revenue [Line Items]
Revenue	922	809	1,796	1,604
Missile Solutions \| International
Disaggregation of Revenue [Line Items]
Revenue	120	108	225	135
Missile Solutions \| Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	704	576	1,347	1,081
Missile Solutions \| Cost-type
Disaggregation of Revenue [Line Items]
Revenue	338	341	674	658
Missile Solutions \| Intersegment
Disaggregation of Revenue [Line Items]
Revenue	(12)	(8)	(23)	(26)
Missile Solutions \| Total segment
Disaggregation of Revenue [Line Items]
Revenue	1,054	925	2,044	1,765
Other \| United States
Disaggregation of Revenue [Line Items]
Revenue				61
Other \| International
Disaggregation of Revenue [Line Items]
Revenue				84
Other \| Fixed-price
Disaggregation of Revenue [Line Items]
Revenue				145
Other \| Cost-type
Disaggregation of Revenue [Line Items]
Revenue				0
Other \| Intersegment
Disaggregation of Revenue [Line Items]
Revenue				(1)
Other \| Total segment
Disaggregation of Revenue [Line Items]
Revenue				146
Prime contractor \| Space & Mission Systems
Disaggregation of Revenue [Line Items]
Revenue	2,177	2,021	4,463	3,746
Prime contractor \| CSD
Disaggregation of Revenue [Line Items]
Revenue	1,300	1,204	2,492	2,377
Prime contractor \| Missile Solutions
Disaggregation of Revenue [Line Items]
Revenue	245	245	495	467
Prime contractor \| Other
Disaggregation of Revenue [Line Items]
Revenue				72
Subcontractor \| Space & Mission Systems
Disaggregation of Revenue [Line Items]
Revenue	767	721	1,448	1,381
Subcontractor \| CSD
Disaggregation of Revenue [Line Items]
Revenue	595	563	1,201	1,170
Subcontractor \| Missile Solutions
Disaggregation of Revenue [Line Items]
Revenue	$ 797	$ 672	$ 1,526	1,272
Subcontractor \| Other
Disaggregation of Revenue [Line Items]
Revenue				$ 73