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INFORMATION ON BUSINESS SEGMENTS - Summary of Operating Results For Each Business Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 25, 2018
Net sales    
Total net sales $ 14,336 $ 11,635
Operating profit    
Total operating profit 2,283 1,725
Aeronautics    
Net sales    
Total net sales 5,584 4,398
Missiles and Fire Control    
Net sales    
Total net sales 2,350 1,677
Rotary and Mission Systems    
Net sales    
Total net sales 3,762 3,223
Space    
Net sales    
Total net sales 2,640 2,337
Business segments    
Net sales    
Total net sales 14,336 11,635
Operating profit    
Total operating profit 1,715 1,310
Business segments | Aeronautics    
Net sales    
Total net sales 5,584 4,398
Operating profit    
Total operating profit 585 474
Business segments | Missiles and Fire Control    
Net sales    
Total net sales 2,350 1,677
Operating profit    
Total operating profit 417 261
Business segments | Rotary and Mission Systems    
Net sales    
Total net sales 3,762 3,223
Operating profit    
Total operating profit 379 311
Business segments | Space    
Net sales    
Total net sales 2,640 2,337
Operating profit    
Total operating profit 334 264
Segment reconciling items    
Unallocated items    
FAS/CAS operating adjustment 512 451
Stock-based compensation (37) (38)
Other, net 93 2
Total unallocated items 568 415
Intersegment sales    
Net sales    
Total net sales 811 626
Intersegment sales | Aeronautics    
Net sales    
Total net sales 42 25
Intersegment sales | Missiles and Fire Control    
Net sales    
Total net sales 121 95
Intersegment sales | Rotary and Mission Systems    
Net sales    
Total net sales 580 461
Intersegment sales | Space    
Net sales    
Total net sales $ 68 $ 45