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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 | 9 Months Ended
--- | --- | ---
Sep. 29, 2019 | Sep. 30, 2018 | Jun. 24, 2018 | Sep. 29, 2019 | Sep. 30, 2018
Net sales |  |  |  |  |
Total net sales | $ 15,171 | $ 14,318 |  | $ 43,934 | $ 39,351
Operating profit |  |  |  |  |
Total operating profit | 2,105 | 1,963 |  | 6,396 | 5,483
Unallocated items |  |  |  |  |
Severance and restructuring charges | 0 | 0 |  | 0 | 96
Aeronautics |  |  |  |  |
Net sales |  |  |  |  |
Total net sales | 6,178 | 5,642 |  | 17,312 | 15,361
Missiles and Fire Control |  |  |  |  |
Net sales |  |  |  |  |
Total net sales | 2,601 | 2,273 |  | 7,362 | 6,035
Rotary and Mission Systems |  |  |  |  |
Net sales |  |  |  |  |
Total net sales | 3,709 | 3,848 |  | 11,239 | 10,637
Unallocated items |  |  |  |  |
Severance and restructuring charges |  |  | $ 96 |  |
Severance and restructuring charges, net of tax |  |  | $ 76 |  |
Severance and restructuring charges (in dollars per share) |  |  | $ 0.26 |  |
Space |  |  |  |  |
Net sales |  |  |  |  |
Total net sales | 2,683 | 2,555 |  | 8,021 | 7,318
Business segments |  |  |  |  |
Net sales |  |  |  |  |
Total net sales | 15,171 | 14,318 |  | 43,934 | 39,351
Operating profit |  |  |  |  |
Total operating profit | 1,665 | 1,586 |  | 4,934 | 4,362
Business segments | Aeronautics |  |  |  |  |
Net sales |  |  |  |  |
Total net sales | 6,178 | 5,642 |  | 17,312 | 15,361
Operating profit |  |  |  |  |
Total operating profit | 665 | 600 |  | 1,842 | 1,646
Business segments | Missiles and Fire Control |  |  |  |  |
Net sales |  |  |  |  |
Total net sales | 2,601 | 2,273 |  | 7,362 | 6,035
Operating profit |  |  |  |  |
Total operating profit | 349 | 332 |  | 1,093 | 872
Business segments | Rotary and Mission Systems |  |  |  |  |
Net sales |  |  |  |  |
Total net sales | 3,709 | 3,848 |  | 11,239 | 10,637
Operating profit |  |  |  |  |
Total operating profit | 342 | 361 |  | 1,068 | 1,013
Business segments | Space |  |  |  |  |
Net sales |  |  |  |  |
Total net sales | 2,683 | 2,555 |  | 8,021 | 7,318
Operating profit |  |  |  |  |
Total operating profit | 309 | 293 |  | 931 | 831
Segment reconciling items |  |  |  |  |
Unallocated items |  |  |  |  |
FAS/CAS operating adjustment | 513 | 451 |  | 1,537 | 1,353
Stock-based compensation | (54) | (50) |  | (158) | (148)
Severance and restructuring charges | 0 | 0 |  | 0 | (96)
Other, net | (19) | (24) |  | 83 | 12
Total unallocated items | 440 | 377 |  | 1,462 | 1,121
Intersegment sales |  |  |  |  |
Net sales |  |  |  |  |
Total net sales | 786 | 764 |  | 2,411 | 2,082
Intersegment sales | Aeronautics |  |  |  |  |
Net sales |  |  |  |  |
Total net sales | 58 | 35 |  | 147 | 87
Intersegment sales | Missiles and Fire Control |  |  |  |  |
Net sales |  |  |  |  |
Total net sales | 107 | 122 |  | 372 | 330
Intersegment sales | Rotary and Mission Systems |  |  |  |  |
Net sales |  |  |  |  |
Total net sales | 530 | 544 |  | 1,648 | 1,509
Intersegment sales | Space |  |  |  |  |
Net sales |  |  |  |  |
Total net sales | $ 91 | $ 63 |  | $ 244 | $ 156

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