OTHER - Contract Estimates (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Jun. 29, 2025	Dec. 31, 2024	Sep. 29, 2024	Mar. 31, 2024	Sep. 28, 2025	Sep. 29, 2024
Change in Accounting Estimate [Line Items]
Select program losses					$ 1,615	$ 248
Contract liabilities		$ 9,795			10,259
TUHP
Change in Accounting Estimate [Line Items]
Select program losses	$ 95
Cumulative losses on development					130
Aeronautics | Classified Program
Change in Accounting Estimate [Line Items]
Select program losses					950
Favorable profit adjustments					80
Reach-forward loss			$ 80			145
Contract liabilities					530
Aeronautics | Classified Program | Initial Phase
Change in Accounting Estimate [Line Items]
Reach-forward loss	950
Cumulative losses on development					1,800
Aeronautics | C-130 Programs
Change in Accounting Estimate [Line Items]
Unfavorable profit adjustments					105
Rotary and Mission Systems | CMHP
Change in Accounting Estimate [Line Items]
Select program losses	$ 570				570
Cumulative losses on development					670
Contract assets					655
Rotary and Mission Systems | TUHP
Change in Accounting Estimate [Line Items]
Select program losses					95
Space | Commercial Civil Space Program
Change in Accounting Estimate [Line Items]
Favorable profit adjustments					130
Missiles and Fire Control | Classified Program
Change in Accounting Estimate [Line Items]
Reach-forward loss		$ 1,310		$ 100		$ 100
Cumulative losses on development					1,460
Contract liabilities					$ 1,250