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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
--- | --- | --- | ---
Mar. 04, 2019 | Sep. 29, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 24, 2018 | Mar. 26, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |
Severance and restructuring charges |  |  |  |  |  |  | $ 0 | $ 96 | $ 0
Gain on property sale |  |  |  |  |  |  | 51 | $ 0 | 198
Foreign derived intangible income deduction related to prior year | $ (75) | $ (62) | $ (65) |  |  |  | (98) |  |
Foreign derived intangible income deduction related to prior year (in dollars per share) | $ 0.26 | $ 0.22 | $ 0.23 |  |  |  |  |  |
Land |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |
Gain on property sale |  |  | $ 51 |  |  |  |  |  | $ 198
Gain on property sale, after tax |  |  | $ 38 |  |  |  |  |  |
Gain on property sale per share, after tax (in dollars per share) |  |  | $ 0.13 |  |  |  |  |  |
AMMROC |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |
Equity method investee impairment |  |  |  | $ 110 |  | $ 64 |  |  |
Equity method investee impairment, net of tax |  |  |  | $ 83 |  | $ 40 |  |  |
Equity method investee impairment (in dollars per share) |  |  |  | $ 0.29 |  | $ 0.14 |  |  |
RMS |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |
Severance and restructuring charges |  |  |  |  | $ 96 |  | 60 |  |
Severance and restructuring charges, net of tax |  |  |  |  | $ 76 |  | $ 47 |  |
Severance and restructuring charges (in dollars per share) |  |  |  |  | $ 0.26 |  | $ 0.17 |  |

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