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INFORMATION ON BUSINESS SEGMENTS - Narrative (Details)
$ / shares in Units, $ in Billions
3 Months Ended 9 Months Ended
Sep. 26, 2021
USD ($)
$ / shares
Sep. 27, 2020
Sep. 26, 2021
USD ($)
segment
$ / shares
Sep. 27, 2020
Aug. 03, 2021
USD ($)
Segment Reporting [Abstract]          
Number of business segments | segment     4    
Segment Reporting Information [Line Items]          
Non-cash, non-operating pension settlement charge $ 1.7   $ 1.7    
Non-cash, non-operating pension settlement charge, after tax $ 1.3   $ 1.3    
Non-cash, non-operating pension settlement charge, per share, after Tax (in dollars per share) | $ / shares $ 4.72   $ 4.72    
Outstanding pension benefit obligations and related plan assets         $ 4.9
Product Concentration Risk | Sales Revenue, Net | F-35 Program | Aeronautics          
Segment Reporting Information [Line Items]          
Net sales for the F-35 program representing total consolidated net sales (as a percent) 28.00% 28.00% 27.00% 28.00%