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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

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