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Components of Net Periodic Pension Cost (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Severance and Related Costs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension curtailment losses |  |  | $ 17
Severance and Related Costs | 2014-2018 Restructuring Program |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement losses | $ 11 | $ 15 | 9
Pension Plans | U.S. Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement losses | 21 | 15 | 10
Pension Plans | Non-U.S. Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement losses | $ 6 | $ 6 | $ 2

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