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Information on Business Segments - Summary of Financial Information for Each Business Segment (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 24, 2018 | Mar. 25, 2018 | Dec. 31, 2017 | Sep. 24, 2017 | Jun. 25, 2017 | Mar. 26, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Aug. 24, 2016 | Aug. 16, 2016
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 14,411 | $ 14,318 | $ 13,398 | $ 11,635 | $ 13,844 | $ 12,341 | $ 12,563 | $ 11,212 | $ 53,762 | $ 49,960 | $ 47,290 |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit | 1,851 | $ 1,963 | 1,795 | $ 1,725 | 1,949 | $ 1,677 | $ 1,716 | 1,402 | 7,334 | 6,744 | 5,888 |  |
Unallocated items |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on property sale |  |  |  |  |  |  |  |  | 0 | 198 | 0 |  |
AMMROC |  |  |  |  |  |  |  |  |  |  |  |  |
Unallocated items |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investee impairment | $ 110 |  |  |  |  |  |  | $ 64 |  |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  |  |  |
Unallocated items |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on property sale |  |  |  |  | $ 198 |  |  |  |  | 198 |  |  |
AWE Management Limited |  |  |  |  |  |  |  |  |  |  |  |  |
Unallocated items |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage owned immediately before acquisition |  |  |  |  |  |  |  |  |  |  |  | 33.00% | 33.00%
Ownership interest percentage owned subsequent acquisition |  |  |  |  |  |  |  |  |  |  |  | 51.00% |
Net Earnings From Continuing Operations | AWE Management Limited |  |  |  |  |  |  |  |  |  |  |  |  |
Unallocated items |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) associated with obtaining control of AWE |  |  |  |  |  |  |  |  |  |  | $ 104 |  |
Increase in net earnings from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.34 |  |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 53,762 | 49,960 | $ 47,290 |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | 5,877 | 5,092 | 4,982 |  |
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |  |
Unallocated items |  |  |  |  |  |  |  |  |  |  |  |  |
FAS/CAS operating adjustment |  |  |  |  |  |  |  |  | 1,803 | 1,613 | 1,250 |  |
Stock-based compensation |  |  |  |  |  |  |  |  | (173) | (158) | (149) |  |
Severance and restructuring charges |  |  |  |  |  |  |  |  | (96) | 0 | (80) |  |
Other, net |  |  |  |  |  |  |  |  | (77) | 197 | (115) |  |
Total unallocated items |  |  |  |  |  |  |  |  | 1,457 | 1,652 | 906 |  |
Aeronautics |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 21,242 | 19,410 | 17,293 |  |
Aeronautics | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 21,242 | 19,410 | 17,293 |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | 2,272 | 2,176 | 1,845 |  |
Missiles and Fire Control |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 8,462 | 7,282 | 6,789 |  |
Missiles and Fire Control | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 8,462 | 7,282 | 6,789 |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | 1,248 | 1,034 | 1,004 |  |
Rotary and Mission Systems |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 14,250 | 13,663 | 13,595 |  |
Unallocated items |  |  |  |  |  |  |  |  |  |  |  |  |
Severance and restructuring charges |  |  | $ 96 |  |  |  |  |  |  |  |  |  |
Rotary and Mission Systems | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 14,250 | 13,663 | 13,595 |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | 1,302 | 902 | 845 |  |
Space |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 9,808 | 9,605 | 9,613 |  |
Space | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 9,808 | 9,605 | 9,613 |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | $ 1,055 | $ 980 | 1,288 |  |
Space | Operating Segments | AWE Management Limited |  |  |  |  |  |  |  |  |  |  |  |  |
Unallocated items |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) associated with obtaining control of AWE |  |  |  |  |  |  |  |  |  |  | $ 127 |  |

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