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Restructuring - Additional Information (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2017 USD ($) ProductionUnit Employees | Oct. 31, 2015 Employees | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2014 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2018 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of land |  |  |  |  |  |  | $ 13 |  |
Marshall, Texas Plan [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Number of idled production units | ProductionUnit | 3 |  |  |  |  |  |  |  |
Number of production units | ProductionUnit | 7 |  |  |  |  |  |  |  |
Number of employees termination | Employees | 40 |  |  |  |  |  |  |  |
Restructuring expected charges | $ 1 |  |  |  |  |  |  |  |
Accelerated depreciation charges |  |  |  |  |  |  | 1 |  |
Marshall, Texas Plan [Member] | Non-Cash Accelerated Depreciation [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring expected charges | 1 |  |  |  |  |  |  |  |
Marshall, Texas Plan [Member] | Severance Costs [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring expected charges | $ 1 |  |  |  |  |  |  |  |
Operational Restructuring [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Number of employees termination | Employees |  | 300 |  |  |  |  |  |  |
Pre-tax charge to earnings |  |  |  |  |  |  | 1 | $ 1 |
Operational Restructuring [Member] | Merak [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of land |  |  |  | $ 9 |  |  |  |  |
Net benefit to earnings |  |  |  | $ 11 |  |  |  |  |
Operational Restructuring [Member] | Thane, India [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of land |  |  |  |  |  |  | 32 |  |
Net benefit to earnings |  |  |  |  |  |  | 32 |  |
Operational Restructuring [Member] | Accounts Payable and Accrued Liabilities [Member] | Merak [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Refundable cash deposit |  |  |  |  | $ 4 |  |  |  |
Operational Restructuring [Member] | Accounts Payable and Accrued Liabilities [Member] | Thane, India [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Refundable cash deposit |  |  | $ 3 |  |  | $ 3 |  |  |
Operational Restructuring [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax charge to earnings |  |  |  |  |  |  |  |  | $ 1
Operational Restructuring [Member] | Maximum [Member] | Merak [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax charge to earnings |  |  |  |  |  |  |  | $ 1 |
Operational Restructuring [Member] | Severance Costs [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Accrued severance charges |  |  | 1 |  |  |  | 1 |  |
Closure Of Carbon Black Facility | Severance Costs [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Accrued severance charges |  |  | $ 1 |  |  |  | 1 |  |
Previous Actions and Sites Pending Sale [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Severance charges |  |  |  |  |  |  | $ 1 |  |

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