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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 |
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Dec. 31, 2017 | Sep. 24, 2017 | Jun. 25, 2017 | Mar. 26, 2017 | Dec. 31, 2016 | Sep. 25, 2016 | Jun. 26, 2016 | Mar. 27, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 24, 2016
Net sales |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 15,137 | $ 12,169 | $ 12,685 | $ 11,057 | $ 13,752 | $ 11,551 | $ 11,577 | $ 10,368 | $ 51,048 | $ 47,248 | $ 40,536 |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Operating profit | $ 1,859 | $ 1,428 | $ 1,485 | 1,149 | $ 1,428 | $ 1,588 | $ 1,375 | $ 1,158 | 5,921 | 5,549 | 4,712 |
FAS/CAS pension adjustment |  |  |  |  |  |  |  |  | 876 | 902 | 400 |
Severance charges |  |  |  |  |  |  |  |  | 0 | 80 | 82 |
Stock-based compensation |  |  |  |  |  |  |  |  | 158 | 149 | 133 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,195 | 1,167 | 945 |
Capital expenditures |  |  |  |  |  |  |  |  | 1,177 | 1,063 | 939 |
Gain on property sale |  |  |  |  |  |  |  |  | 198 | 0 | 0 |
Equity method investee impairment |  |  |  |  |  |  |  |  |  |  | 90 |
Net deferred tax expense (benefit) |  |  |  |  |  |  |  |  | 1,613 | (231) | (473) |
Lockheed Martin Commercial Flight Training |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Net deferred tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | (80) |
AWE Management Limited |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage owned immediately before acquisition |  |  |  |  |  |  |  |  |  |  |  | 33.00%
Ownership interest percentage owned subsequent acquisition |  |  |  |  |  |  |  |  |  |  |  | 51.00%
Sikorsky Aircraft Corporation |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Non-recoverable transaction costs |  |  |  |  |  |  |  |  |  |  | 38 |
Information Systems & Global Solutions |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 48 | 81 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 9 | 31 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Lockheed Martin Commercial Flight Training |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Net deferred tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | (80) |
Reduction in net earnings |  |  |  |  |  |  |  |  |  |  | 10 |
Net Earnings From Continuing Operations | AWE Management Limited |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) associated with obtaining control of AWE |  |  |  |  |  |  |  |  |  | $ 104 |  |
Increase in net earnings from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.34 |  |
Continuing Operations |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 1,177 | $ 1,054 | 908 |
Aeronautics |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 20,148 | 17,769 | 15,570 |
Missiles and Fire Control |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,212 | 6,608 | 6,770 |
Rotary and Mission Systems |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 14,215 | 13,462 | 9,091 |
Space |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 9,473 | 9,409 | 9,105 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | 5,115 | 5,100 | 4,978 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,123 | 1,092 | 847 |
Capital expenditures |  |  |  |  |  |  |  |  | 1,014 | 979 | 848 |
Operating Segments | Aeronautics |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | 2,164 | 1,887 | 1,681 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 311 | 299 | 317 |
Capital expenditures |  |  |  |  |  |  |  |  | 371 | 358 | 387 |
Operating Segments | Missiles and Fire Control |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | 1,053 | 1,018 | 1,282 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 99 | 105 | 99 |
Capital expenditures |  |  |  |  |  |  |  |  | 156 | 167 | 120 |
Operating Segments | Rotary and Mission Systems |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | 905 | 906 | 844 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 468 | 476 | 211 |
Capital expenditures |  |  |  |  |  |  |  |  | 308 | 271 | 169 |
Operating Segments | Space |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | 993 | 1,289 | 1,171 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 245 | 212 | 220 |
Capital expenditures |  |  |  |  |  |  |  |  | 179 | 183 | 172 |
Operating Segments | Space | AWE Management Limited |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) associated with obtaining control of AWE |  |  |  |  |  |  |  |  |  | 127 |  |
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit cost |  |  |  |  |  |  |  |  | (1,372) | (1,019) | (1,127) |
Less: CAS pension cost |  |  |  |  |  |  |  |  | 2,248 | 1,921 | 1,527 |
FAS/CAS pension adjustment |  |  |  |  |  |  |  |  | 876 | 902 | 400 |
Severance charges |  |  |  |  |  |  |  |  | 0 | (80) | (82) |
Stock-based compensation |  |  |  |  |  |  |  |  | (158) | (149) | (133) |
Other, net |  |  |  |  |  |  |  |  | 88 | (224) | (451) |
Total unallocated items |  |  |  |  |  |  |  |  | 806 | 449 | (266) |
Intersegment sales |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,608 | 2,368 | 2,096 |
Intersegment sales | Aeronautics |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 122 | 137 | 102 |
Intersegment sales | Missiles and Fire Control |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 366 | 305 | 315 |
Intersegment sales | Rotary and Mission Systems |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,009 | 1,816 | 1,533 |
Intersegment sales | Space |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 111 | 110 | 146 |
Corporate activities |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 72 | 75 | 98 |
Capital expenditures |  |  |  |  |  |  |  |  | 163 | 75 | $ 60 |
Corporate activities | AWE Management Limited |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) associated with obtaining control of AWE |  |  |  |  |  |  |  |  |  | $ (23) |  |
Land |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Gain on property sale |  |  |  |  |  |  |  |  | 198 |  |  |
AMMROC |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |
Equity method investee impairment |  |  |  | $ 64 |  |  |  |  | $ 64 |  |  |

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