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INFORMATION ON BUSINESS SEGMENTS - Summary of Operating Results For Each Business Segment (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2020 | Jun. 30, 2019 | Jun. 28, 2020 | Jun. 30, 2019
Net sales |  |  |  |
Total net sales | $ 16,220 | $ 14,427 | $ 31,871 | $ 28,763
Operating profit |  |  |  |
Total operating profit | 2,086 | 2,008 | 4,208 | 4,291
Unallocated items |  |  |  |
Equity method investment impairment | 128 |  | 128 | 0
Equity method investment impairment, after tax | $ 96 |  | $ 96 |
Equity method investment impairment (in USD per share) | $ 0.34 |  | $ 0.34 |
Aeronautics |  |  |  |
Net sales |  |  |  |
Total net sales | $ 6,503 | 5,550 | $ 12,872 | 11,134
Missiles and Fire Control |  |  |  |
Net sales |  |  |  |
Total net sales | 2,801 | 2,411 | 5,420 | 4,761
Rotary and Mission Systems |  |  |  |
Net sales |  |  |  |
Total net sales | 4,039 | 3,768 | 7,785 | 7,530
Space |  |  |  |
Net sales |  |  |  |
Total net sales | 2,877 | 2,698 | 5,794 | 5,338
Business segments |  |  |  |
Net sales |  |  |  |
Total net sales | 16,220 | 14,427 | 31,871 | 28,763
Operating profit |  |  |  |
Total operating profit | 1,790 | 1,554 | 3,515 | 3,269
Business segments | Aeronautics |  |  |  |
Net sales |  |  |  |
Total net sales | 6,503 | 5,550 | 12,872 | 11,134
Operating profit |  |  |  |
Total operating profit | 739 | 592 | 1,411 | 1,177
Business segments | Missiles and Fire Control |  |  |  |
Net sales |  |  |  |
Total net sales | 2,801 | 2,411 | 5,420 | 4,761
Operating profit |  |  |  |
Total operating profit | 370 | 327 | 766 | 744
Business segments | Rotary and Mission Systems |  |  |  |
Net sales |  |  |  |
Total net sales | 4,039 | 3,768 | 7,785 | 7,530
Operating profit |  |  |  |
Total operating profit | 429 | 347 | 805 | 726
Business segments | Space |  |  |  |
Net sales |  |  |  |
Total net sales | 2,877 | 2,698 | 5,794 | 5,338
Operating profit |  |  |  |
Total operating profit | 252 | 288 | 533 | 622
Segment reconciling items |  |  |  |
Unallocated items |  |  |  |
FAS/CAS operating adjustment | 469 | 512 | 938 | 1,024
Stock-based compensation | (73) | (67) | (115) | (104)
Other, net | (100) | 9 | (130) | 102
Total unallocated items | 296 | 454 | 693 | 1,022
Intersegment sales |  |  |  |
Net sales |  |  |  |
Total net sales | 808 | 737 | 1,609 | 1,467
Intersegment sales | Aeronautics |  |  |  |
Net sales |  |  |  |
Total net sales | 61 | 47 | 120 | 89
Intersegment sales | Missiles and Fire Control |  |  |  |
Net sales |  |  |  |
Total net sales | 140 | 144 | 276 | 265
Intersegment sales | Rotary and Mission Systems |  |  |  |
Net sales |  |  |  |
Total net sales | 502 | 461 | 1,000 | 960
Intersegment sales | Space |  |  |  |
Net sales |  |  |  |
Total net sales | $ 105 | $ 85 | $ 213 | $ 153

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