OTHER - Contract Estimates (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 29, 2025	Jun. 28, 2026	Jun. 29, 2025	Dec. 31, 2025
Change in Accounting Estimate [Line Items]
Contract liabilities		$ 12,151		$ 11,440
Reach-forward losses on select programs		0	$ (1,615)
F-16 Program
Change in Accounting Estimate [Line Items]
Unfavorable profit adjustments		125
CMHP
Change in Accounting Estimate [Line Items]
Reach-forward loss	$ 570
Additional Losses	570
TUHP
Change in Accounting Estimate [Line Items]
Reach-forward loss	95
Cumulative losses on development		130
Reach-forward losses on select programs	95
Aeronautics \| C-130 Program
Change in Accounting Estimate [Line Items]
Unfavorable profit adjustments		95
Aeronautics \| Classified Program
Change in Accounting Estimate [Line Items]
Reach-forward loss	950		80
Contract liabilities		427
Aeronautics \| Classified Program \| Initial Phase
Change in Accounting Estimate [Line Items]
Reach-forward loss	$ 950
Cumulative losses on development		1,800
Space \| Commercial Civil Space Programs
Change in Accounting Estimate [Line Items]
Reach-forward loss			$ 125
MFC \| Classified Program
Change in Accounting Estimate [Line Items]
Cumulative losses on development		1,500
Contract liabilities		1,100
RMS \| CH-53K program
Change in Accounting Estimate [Line Items]
Favorable profit adjustments		95
RMS \| Seahawk program
Change in Accounting Estimate [Line Items]
Favorable profit adjustments		80
RMS \| CMHP
Change in Accounting Estimate [Line Items]
Cumulative losses on development		670
Contract liabilities		365
Contract assets		$ 585