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Information on Business Segments - Narrative (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Number of business segments | segment | 4 |  |
Equity method investments | $ 1,200 | $ 1,200 |
Net Sales | Product Concentration Risk | F-35 Program | Aeronautics |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales for the F-35 program representing total consolidated net sales (as a percent) | 27.00% | 27.00% | 26.00%
United Launch Alliance |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of ownership interest in affiliated entity | 50.00% |  |
Equity method investments | $ 709 | $ 687 |

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