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Acquisitions and Divestitures - Additional Information (Detail) - USD ($) |  |  |  | 2 Months Ended | 3 Months Ended | 8 Months Ended | 12 Months Ended | 16 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 24, 2016 | Aug. 16, 2016 | Nov. 06, 2015 | Dec. 31, 2015 | 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, 2015 | Aug. 23, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions of businesses and investments in affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 9,003,000,000 |
Proceeds from borrowings under revolving credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 6,000,000,000 |
Proceeds from issuance of fixed interest-rate long-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 9,101,000,000 |
Aggregate amount of goodwill arising from acquisitions |  |  |  | $ 10,695,000,000 | $ 10,807,000,000 |  |  |  | $ 10,764,000,000 |  |  |  | $ 10,695,000,000 |  | 10,807,000,000 | 10,764,000,000 | 10,695,000,000 | $ 10,807,000,000
Amortization of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 312,000,000 | 284,000,000 | 68,000,000 |
Income tax charge related to historic earnings of foreign subsidiaries |  |  |  | 310,000,000 |  |  |  |  | 386,000,000 |  |  |  | 310,000,000 |  |  | 386,000,000 | 310,000,000 |
One-time special cash payment received from Abacus |  | $ 1,800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 1,800,000,000 | 0 |
Net gain on divestiture of business segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73,000,000 | 1,242,000,000 | 0 |
Fair value of shares of common stock tendered and retired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,497,000,000 |  |
Severance charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 99,000,000 | 102,000,000 |
Net deferred tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,613,000,000 | (231,000,000) | (473,000,000) |
Net earnings from discontinued operations |  |  |  |  | 73,000,000 | $ 0 | $ 0 | $ 0 | 29,000,000 | $ 1,306,000,000 | $ 122,000,000 | $ 92,000,000 |  |  | 73,000,000 | 1,549,000,000 | 479,000,000 |
Space |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of goodwill arising from acquisitions |  |  |  | 1,588,000,000 | 1,587,000,000 |  |  |  | 1,585,000,000 |  |  |  | 1,588,000,000 |  | 1,587,000,000 | 1,585,000,000 | 1,588,000,000 | 1,587,000,000
November 2015 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of issued debt |  |  |  | 7,000,000,000.0 |  |  |  |  |  |  |  |  | 7,000,000,000.0 |  |  |  | 7,000,000,000.0 |
Abacus | Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of issued debt |  | $ 1,840,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | $ 1,300,000,000 |  |  | 73,000,000 |  |  |  |  | 1,200,000,000 |  |  |  |  |  | 1,200,000,000 |  |
Fair value of shares of common stock tendered and retired |  | 2,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net book value |  | 3,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other adjustments |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information Systems & Global Solutions | Lockheed Martin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock exchanged (in shares) |  | 9,369,694 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information Systems & Global Solutions | Continuing Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 54,000,000 | 71,000,000 |
Information Systems & Global Solutions | Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,000,000 | 20,000,000 |
Information Systems & Global Solutions | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate overhead costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (82,000,000) | (165,000,000) |
Information Systems & Global Solutions | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain on divestiture of business segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73,000,000 |  |  |
Net earnings from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,549,000,000 | 479,000,000 |
Lockheed Martin Commercial Flight Training | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,000,000 |
Net deferred tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (80,000,000) |
Reduction in net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |
Sikorsky Aircraft Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions of businesses and investments in affiliates |  |  | $ 9,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash on hand |  |  | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of Commercial Paper |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of commercial paper |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 |  |  |  |  |
Acquired intangible assets, weighted average period of amortization |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer contractual obligations |  |  | $ 507,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales related to customer contractual obligations, to date |  |  |  |  | 225,000,000 |  |  |  |  |  |  |  |  |  | 225,000,000 |  |  | 225,000,000
Customer contractual obligations due in 2018 |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  | 100,000,000
Customer contractual obligations due in 2019 |  |  |  |  | 55,000,000 |  |  |  |  |  |  |  |  |  | 55,000,000 |  |  | 55,000,000
Customer contractual obligations due in 2020 |  |  |  |  | 55,000,000 |  |  |  |  |  |  |  |  |  | 55,000,000 |  |  | 55,000,000
Customer contractual obligations due in 2021 |  |  |  |  | 55,000,000 |  |  |  |  |  |  |  |  |  | 55,000,000 |  |  | 55,000,000
Customer contractual obligations due in 2022 |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  | 5,000,000
Customer contractual obligations due after 2022 |  |  |  |  | $ 12,000,000 |  |  |  |  |  |  |  |  |  | $ 12,000,000 |  |  | $ 12,000,000
Aggregate amount of goodwill arising from acquisitions |  |  | 2,842,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  | 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings (loss) |  |  |  | (45,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recoverable transaction costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,000,000 |
Net liabilities |  |  | 2,989,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sikorsky Aircraft Corporation | 364 Day Revolving Credit Facility And Five Year Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings under revolving credit facilities |  |  | $ 6,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 364 days |  |  |
Sikorsky Aircraft Corporation | November 2015 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of fixed interest-rate long-term notes |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000,000 |  |  |  |  |
Costs associated with issuance of fixed interest-rate long-term notes |  |  |  | 48,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sikorsky Aircraft Corporation | Pro Forma Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125,000,000 |
Interest expense, debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 |
Pension curtailment loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72,000,000 |
Income tax charge related to historic earnings of foreign subsidiaries |  |  |  | $ 58,000,000 |  |  |  |  |  |  |  |  | $ 58,000,000 |  |  |  | 58,000,000 |
Sikorsky Aircraft Corporation | Unaudited Supplemental Pro Forma Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in interest expense, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 110,000,000 |
AWE Management Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage owned immediately before acquisition | 33.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 307,000,000 | 103,000,000 |  |  |  |  |  |  |  |
Net earnings (loss) |  |  |  |  |  |  |  |  | $ 3,000,000 | $ 104,000,000 |  |  |  |  |  |  |  |
Ownership interest percentage owned subsequent acquisition | 51.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net liabilities | $ 32,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, acquisition of less than 100 percent, noncontrolling interest, fair value | 107,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AWE Management Limited | Net Sales | Segment Concentration Risk | Space |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  | 100.00%
AWE Management Limited | Net Sales | Equity Method Investment Risk | Space |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |
AWE Management Limited | Operating profit | Segment Concentration Risk | Space |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00% |  |  | 51.00%
AWE Management Limited | Net Earnings | Equity Method Investment Risk | Space |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |  |
AWE Management Limited | Net Earnings From Continuing Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) associated with obtaining control of AWE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 104,000,000 |  |
AWE Management Limited | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | $ 243,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized | 8 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain recognized in operating results of Space System business segment | AWE Management Limited | Space |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) associated with obtaining control of AWE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 127,000,000 |  |
Deferred tax liabilities at corporate office | AWE Management Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) associated with obtaining control of AWE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (23,000,000) |  |

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