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Information on Business Segments - Total Assets and Customer Advances and Amounts In Excess Of Costs Incurred For Each Business Segment (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets | $ 44,876 | $ 46,620
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Assets | 37,230 | 35,822
Operating Segments | Aeronautics |  |
Segment Reporting Information [Line Items] |  |
Assets | 8,435 | 7,713
Operating Segments | Missiles and Fire Control |  |
Segment Reporting Information [Line Items] |  |
Assets | 5,017 | 4,577
Operating Segments | Rotary and Mission Systems |  |
Segment Reporting Information [Line Items] |  |
Assets | 18,333 | 18,292
Operating Segments | Space |  |
Segment Reporting Information [Line Items] |  |
Assets | 5,445 | 5,240
Corporate activities |  |
Segment Reporting Information [Line Items] |  |
Assets | $ 7,646 | $ 10,798

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