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Acquisition and Divestitures - Additional Information (Detail) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 24, 2016 | Aug. 16, 2016 | Nov. 06, 2015 | Sep. 25, 2016 | Dec. 31, 2015 | Sep. 27, 2015 | Sep. 25, 2016 | Sep. 27, 2015 | Dec. 31, 2015
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 10,791 | $ 10,695 |  | $ 10,791 |  | $ 10,695
Gain on step acquisition of AWE, net of tax |  |  |  |  |  |  | 104 |  |
One-time special cash payment received from Abacus |  | $ 1,800 |  |  |  |  | 1,800 |  |
Net gain on divestiture of business segment |  |  |  |  |  |  | 1,234 |  |
Fair value of shares of common stock tendered and retired |  |  |  |  |  |  | 2,497 |  |
Other unallocated, net |  |  |  | (173) |  | $ 32 | (401) | $ 61 |
Severance charges |  |  |  |  | 82 | 82 | 99 | 35 |
Abacus | Term Loan Facilities |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |
Amount of issued debt |  | $ 1,840 |  |  |  |  |  |  |
Information Systems & Global Solutions |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |
Percentage of reduction in common stock outstanding |  | 3.00% |  |  |  |  |  |  |
Net gain on divestiture of business segment |  | $ 1,200 |  |  |  |  |  |  |
Fair value of shares of common stock tendered and retired |  | 2,500 |  |  |  |  |  |  |
Net book value |  | 3,000 |  |  |  |  |  |  |
Other adjustments |  | $ 100 |  |  |  |  |  |  |
Other unallocated, net |  |  |  | 17 |  | 40 | 82 | 133 |
Information Systems & Global Solutions | Abacus |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |
Number of common stock exchanged |  | 76,958,918 |  |  |  |  |  |  |
Information Systems & Global Solutions | Lockheed Martin |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |
Number of common stock exchanged |  | 9,369,694 |  |  |  |  |  |  |
Information Systems & Global Solutions | Continuing Operations |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |
Pension costs |  |  |  | 11 |  | 17 | 54 | 53 |
Information Systems & Global Solutions | Discontinued Operations |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |
Severance charges |  |  |  |  |  | 20 | 19 | 20 |
Information Systems & Global Solutions | Restatement Adjustment |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |
Corporate overhead costs |  |  |  | (17) |  | (40) | (82) | (133) |
Sikorsky Aircraft Corporation |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |
Acquisitions of businesses and investments in affiliates |  |  | $ 9,000 |  |  |  |  |  |
Cash on hand |  |  | 2,000 |  |  |  |  |  |
Proceeds from Issuance of Commercial Paper |  |  | $ 1,000 |  |  |  |  |  |
Repayment of commercial paper |  |  |  |  | 1,000 |  |  |  |
Intangible assets weighted-average useful life |  |  | 15 years |  |  |  |  |  |
Customer contractual obligations |  |  | $ 507 |  |  |  |  |  |
Customer contractual obligations remaining in 2016 |  |  |  | 30 |  |  | 30 |  |
Customer contractual obligations due in 2017 |  |  |  | 110 |  |  | 110 |  |
Customer contractual obligations due in 2018 |  |  |  | 70 |  |  | 70 |  |
Customer contractual obligations due in 2019 |  |  |  | 70 |  |  | 70 |  |
Customer contractual obligations due in 2020 |  |  |  | 60 |  |  | 60 |  |
Customer contractual obligations due in 2021 |  |  |  | 10 |  |  | 10 |  |
Customer contractual obligations due after 2021 |  |  |  | 57 |  |  | 57 |  |
Sales related to customer contractual obligations, to date |  |  |  | 100 |  |  | $ 100 |  |
Goodwill |  |  | 2,853 |  |  |  |  |  |
Net liabilities |  |  | 2,940 |  |  |  |  |  |
Sikorsky Aircraft Corporation | Three Hundred And Sixty Four Day Revolving Credit Facility And Five Year Revolving Credit Facility |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from borrowings under revolving credit facilities |  |  | $ 6,000 |  |  |  |  |  |
Sikorsky Aircraft Corporation | November 2015 Notes |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of fixed interest-rate long-term notes |  |  |  |  | $ 7,000 |  |  |  |
Sikorsky Aircraft Corporation | Pro Forma Adjustment |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |
Amortization expense, net of tax expense |  |  |  |  |  | 40 |  | 115 |
Amortization expense, tax expense |  |  |  |  |  | 20 |  | 60 |
Interest expense, net of tax expense |  |  |  |  |  | 45 |  | 130 |
Interest expense, tax expense |  |  |  |  |  | $ 20 |  | $ 65 |
AWE Management Limited |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest percentage acquired | 18.00% |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,500
Net earnings |  |  |  |  |  |  |  |  | $ 85
Noncontrolling Interest, Ownership Percentage by Parent | 51.00% |  |  |  |  |  |  |  |
Net liabilities | $ 32 |  |  |  |  |  |  |  |
Business combination, acquisition of less than 100 percent, noncontrolling interest, fair value | 107 |  |  |  |  |  |  |  |
AWE Management Limited | Other income, net |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |
Gain on step acquisition of AWE, net of tax |  |  |  | 104 |  |  |  |  |
Pre tax gain on step acquisition of AWE |  |  |  | 127 |  |  |  |  |
Tax on gain on step acquisition of AWE |  |  |  | $ 23 |  |  |  |  |
AWE Management Limited | Customer relationships |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets | $ 243 |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized | 8 years |  |  |  |  |  |  |  |

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