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Legal Proceedings - Additional Information (Detail) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) Site | Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |
Litigation reserve |  | $ 41 | $ 53
Litigation related receivables |  |  | 10
Deferred Prosecution Agreement |  |  |
Loss Contingencies [Line Items] |  |  |
Civil settlement amount | $ 18 |  |
Superfund Sites | Environmental Clean-up |  |  |
Loss Contingencies [Line Items] |  |  |
Number of sites | Site |  | 7 |
Name of site |  | Superfund |
Environmental reserves |  | $ 21 | $ 7
Superfund Sites | Environmental Clean-up | (Loss) Income from Discontinued Operations, Net of Tax |  |  |
Loss Contingencies [Line Items] |  |  |
Environmental charge |  | $ 15 |

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