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v3.20.2

Commitments and Contingencies - Additional Information (Detail) | 6 Months Ended | 132 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) Site | Jun. 30, 2019 USD ($) | Dec. 31, 2018 Lawsuit | Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Litigation reserve | $ 45,000,000 |  |  | $ 56,000,000
Litigation related receivables | $ 0 |  |  | 0
Proceeds from insurance dispute settlements |  | $ 35,000,000 |  |
Gain on insurance claims |  | $ 33,000,000 |  |
Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of law suits filed | Lawsuit |  |  | 1,000 |
Superfund Sites | Environmental Clean-up |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of sites | Site | 6 |  |  |
Environmental reserves | $ 18,000,000 |  |  | $ 18,000,000

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