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Acquisition and Divestitures - Additional Information (Detail) $ in Millions |  |  | 3 Months Ended | 8 Months Ended | 12 Months Ended | 28 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 24, 2016 USD ($) | Aug. 16, 2016 USD ($) shares | Dec. 31, 2017 USD ($) | Aug. 23, 2016 | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |
One-time special cash payment received from Abacus |  | $ 1,800 |  |  | $ 0 | $ 0 | $ 1,800 |
Net gain on divestiture of business segment |  |  |  |  | $ 0 | $ 73 | 1,201 |
Fair value of shares of common stock tendered and retired |  |  |  |  |  |  | 2,497 |
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 |  | $ 1,300 |  |  |  |  | 1,200 |
Fair value of shares of common stock tendered and retired |  | 2,500 |  |  |  |  |  |
Net book value |  | 3,000 |  |  |  |  |  |
Other adjustments |  | $ 100 |  |  |  |  |  |
Information Systems & Global Solutions | Lockheed Martin |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |
Number of common stock exchanged (in shares) | shares |  | 9,369,694 |  |  |  |  |  |
Conversion ratio |  | 1 |  |  |  |  |  |
Information Systems & Global Solutions | Continuing Operations |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |
Pension costs |  |  |  |  |  |  | 54 |
Information Systems & Global Solutions | Discontinued Operations |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |
Severance charges |  |  |  |  |  |  | 19 |
Information Systems & Global Solutions | Adjustments for |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |
Corporate overhead |  |  |  |  |  |  | (82) |
Information Systems & Global Solutions | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |
Net gain on divestiture of business segment |  |  | $ 73 |  |  |  |  |
AWE Management Limited |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |
Ownership interest percentage owned immediately before acquisition | 33.00% | 33.00% |  |  |  |  |  |
Ownership interest percentage owned subsequent acquisition | 51.00% |  |  |  |  |  |  |
Net liabilities | $ 32 |  |  |  |  |  |  |
Business combination, acquisition of less than 100 percent, noncontrolling interest, fair value | 107 |  |  |  |  |  |  |
AWE Management Limited | Net Earnings From Continuing Operations |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |
Gain (loss) associated with obtaining control of AWE |  |  |  |  |  |  | 104 |
AWE Management Limited | Customer relationships |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |
Intangible assets | $ 243 |  |  |  |  |  |  |
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 |
Deferred tax liabilities at corporate office | AWE Management Limited |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |
Gain (loss) associated with obtaining control of AWE |  |  |  |  |  |  | $ 23 |
Net Sales | AWE Management Limited | Segment Concentration Risk | Space |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |
Concentration percentage |  |  |  |  | 100.00% |  |  | 100.00%
Net Sales | AWE Management Limited | Equity Method Investment Risk | Space |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |
Concentration percentage |  |  |  | 0.00% |  |  |  |
Operating profit | AWE Management Limited | Segment Concentration Risk | Space |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |
Concentration percentage |  |  |  |  | 51.00% |  | 51.00% | 51.00%
Net Earnings | AWE Management Limited | Equity Method Investment Risk | Space |  |  |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |  |  |
Concentration percentage |  |  |  | 33.00% |  |  |  |

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