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Tax Matters - Narrative (Detail) - USD ($) $ in Billions | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Oct. 01, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Repatriation tax liability |  |  |  |  | $ 15.2
Provisional deferred tax liability |  |  |  |  | $ 1.0
Effective tax rate for income from continuing operations | 1.60% | 20.30% | 9.90% | 20.10% |

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