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INFORMATION ON BUSINESS SEGMENTS - Summary of Operating Results For Each Business Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 28, 2021
Mar. 29, 2020
Net sales    
Total net sales $ 16,258 $ 15,651
Operating profit    
Total operating profit 2,182 2,122
Unallocated items    
Severance and restructuring costs 36 0
Aeronautics    
Net sales    
Total net sales 6,387 6,369
Missiles and Fire Control    
Net sales    
Total net sales 2,749 2,619
Rotary and Mission Systems    
Net sales    
Total net sales 4,107 3,746
Space    
Net sales    
Total net sales 3,015 2,917
Business Segments    
Net sales    
Total net sales 16,258 15,651
Operating profit    
Total operating profit 1,749 1,725
Business Segments | Aeronautics    
Net sales    
Total net sales 6,387 6,369
Operating profit    
Total operating profit 693 672
Business Segments | Missiles and Fire Control    
Net sales    
Total net sales 2,749 2,619
Operating profit    
Total operating profit 396 396
Business Segments | Rotary and Mission Systems    
Net sales    
Total net sales 4,107 3,746
Operating profit    
Total operating profit 433 376
Business Segments | Space    
Net sales    
Total net sales 3,015 2,917
Operating profit    
Total operating profit 227 281
Segment Reconciling Items    
Unallocated items    
FAS/CAS operating adjustment 489 469
Stock-based compensation (47) (42)
Severance and restructuring costs (36) 0
Other, net 27 (30)
Total unallocated items 433 397
Intersegment sales    
Net sales    
Total net sales 742 802
Intersegment sales | Aeronautics    
Net sales    
Total net sales 53 59
Intersegment sales | Missiles and Fire Control    
Net sales    
Total net sales 129 136
Intersegment sales | Rotary and Mission Systems    
Net sales    
Total net sales 478 499
Intersegment sales | Space    
Net sales    
Total net sales $ 82 $ 108