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Summary of Quarterly Information (Unaudited) - Additional Information Narrative (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 16, 2016 | Dec. 31, 2018 | Jun. 24, 2018 | Dec. 31, 2017 | Mar. 26, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Remeasurement of deferred tax asset |  |  |  | $ 2,000 |  |  |  |
Effect of tax cut on earnings per share (in dollars per share) |  |  |  | $ 6.88 |  |  | $ 6.77 |
Gain on property sale |  |  |  |  |  | $ 0 | $ 198 | $ 0
Net gain on divestiture of business segment |  |  |  |  |  | $ 0 | 73 | 1,201
Information Systems & Global Solutions |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Net gain on divestiture of business segment | $ 1,300 |  |  |  |  |  |  | $ 1,200
Land |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Gain on property sale |  |  |  | $ 198 |  |  | 198 |
Gain on property sale, after tax |  |  |  | $ 122 |  |  | $ 122 |
Gain on property sale per share, after tax (in dollars per share) |  |  |  | $ 0.43 |  |  | $ 0.42 |
AMMROC |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Equity method investee impairment |  | $ 110 |  |  | $ 64 |  |  |
Increase in net earnings due to profit rate adjustments |  | $ 83 |  |  | $ 40 |  |  |
Increase in diluted earnings per common share due to profit rate adjustments (in dollars per share) |  | $ 0.29 |  |  | $ 0.14 |  |  |
RMS |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Severance and restructuring charges |  |  | $ 96 |  |  |  |  |
Severance and restructuring charges, net of tax |  |  | $ 76 |  |  |  |  |
Severance and restructuring charges (in dollars per share) |  |  | $ 0.26 |  |  |  |  |
EADGE-T |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Contract loss incurred, gross |  |  |  |  | $ 120 |  |  |
Contract loss incurred, after tax |  |  |  |  | $ 74 |  |  |
Contract loss incurred, after tax (in dollars per share) |  |  |  |  | $ 0.25 |  |  |
Discontinued Operations, Disposed of by Sale | Information Systems & Global Solutions |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Net gain on divestiture of business segment |  |  |  | $ 73 |  |  |  |

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