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Information on Business Segments - Summary of Financial Information for Each Business Segment, Intersegment Sale, Depreciation and Capital Expenditures (Details) - USD ($) $ 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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 14,411 | $ 14,318 | $ 13,398 | $ 11,635 | $ 13,844 | $ 12,341 | $ 12,563 | $ 11,212 | $ 53,762 | $ 49,960 | $ 47,290
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,161 | 1,195 | 1,167
Capital expenditures |  |  |  |  |  |  |  |  | 1,278 | 1,177 | 1,063
Aeronautics |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 21,242 | 19,410 | 17,293
MFC |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 8,462 | 7,282 | 6,789
Rotary and Mission Systems |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 14,250 | 13,663 | 13,595
Space |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 9,808 | 9,605 | 9,613
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,806 | 2,608 | 2,405
Intersegment Eliminations | Aeronautics |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 120 | 122 | 142
Intersegment Eliminations | MFC |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 423 | 355 | 299
Intersegment Eliminations | Rotary and Mission Systems |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,026 | 2,020 | 1,854
Intersegment Eliminations | Space |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 237 | 111 | 110
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 53,762 | 49,960 | 47,290
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,096 | 1,123 | 1,092
Capital expenditures |  |  |  |  |  |  |  |  | 1,214 | 1,014 | 979
Operating Segments | Aeronautics |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 21,242 | 19,410 | 17,293
Depreciation and amortization |  |  |  |  |  |  |  |  | 304 | 311 | 299
Capital expenditures |  |  |  |  |  |  |  |  | 460 | 371 | 358
Operating Segments | MFC |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 8,462 | 7,282 | 6,789
Depreciation and amortization |  |  |  |  |  |  |  |  | 105 | 99 | 105
Capital expenditures |  |  |  |  |  |  |  |  | 244 | 156 | 167
Operating Segments | Rotary and Mission Systems |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 14,250 | 13,663 | 13,595
Depreciation and amortization |  |  |  |  |  |  |  |  | 458 | 468 | 476
Capital expenditures |  |  |  |  |  |  |  |  | 255 | 308 | 271
Operating Segments | Space |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 9,808 | 9,605 | 9,613
Depreciation and amortization |  |  |  |  |  |  |  |  | 229 | 245 | 212
Capital expenditures |  |  |  |  |  |  |  |  | 255 | 179 | 183
Corporate activities |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 65 | 72 | 75
Capital expenditures |  |  |  |  |  |  |  |  | 64 | 163 | 75
Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | $ 1,278 | $ 1,177 | 1,054
Information Systems & Global Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 48
Capital expenditures |  |  |  |  |  |  |  |  |  |  | $ 9

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