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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, 2017 | Dec. 31, 2016
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Segment Reporting Information [Line Items] |  |
Assets | $ 46,521 | $ 47,806
Customer advances and amounts in excess of costs incurred | 6,752 | 6,776
Aeronautics |  |
Segment Reporting Information [Line Items] |  |
Customer advances and amounts in excess of costs incurred | 2,752 | 2,133
Missiles and Fire Control |  |
Segment Reporting Information [Line Items] |  |
Customer advances and amounts in excess of costs incurred | 1,268 | 1,517
Rotary and Mission Systems |  |
Segment Reporting Information [Line Items] |  |
Customer advances and amounts in excess of costs incurred | 2,288 | 2,590
Space |  |
Segment Reporting Information [Line Items] |  |
Customer advances and amounts in excess of costs incurred | 444 | 536
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Assets | 35,769 | 35,513
Operating Segments | Aeronautics |  |
Segment Reporting Information [Line Items] |  |
Assets | 7,903 | 7,896
Operating Segments | Missiles and Fire Control |  |
Segment Reporting Information [Line Items] |  |
Assets | 4,395 | 4,000
Operating Segments | Rotary and Mission Systems |  |
Segment Reporting Information [Line Items] |  |
Assets | 18,235 | 18,367
Operating Segments | Space |  |
Segment Reporting Information [Line Items] |  |
Assets | 5,236 | 5,250
Corporate activities |  |
Segment Reporting Information [Line Items] |  |
Assets | $ 10,752 | $ 12,293

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