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Employee Benefit Plans - Schedule of Pension Plan Assets at Fair Value (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 8 | $ 12 | $ 11
Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 68 | 75 |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Recurring | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 60 | 63 |
Recurring | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 8 | 12 |
Recurring | Money market funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 1 | 2 |
Recurring | Money market funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Recurring | Money market funds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 1 | 2 |
Recurring | Money market funds | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Recurring | Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 22 | 24 |
Recurring | Equity funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Recurring | Equity funds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 22 | 24 |
Recurring | Equity funds | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Recurring | Bond/fixed-income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 35 | 31 |
Recurring | Bond/fixed-income funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Recurring | Bond/fixed-income funds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 35 | 31 |
Recurring | Bond/fixed-income funds | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Recurring | Real-estate indirect investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 2 | 6 |
Recurring | Real-estate indirect investments | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Recurring | Real-estate indirect investments | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 2 | 6 |
Recurring | Real-estate indirect investments | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Recurring | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 8 | 12 |
Recurring | Insurance contracts | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Recurring | Insurance contracts | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Recurring | Insurance contracts | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 8 | $ 12 |

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