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Landfill and Environmental Remediation Liabilities - Est payments (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Landfill and Environmental Remediation Liabilities  
Anticipated payments for currently identified environmental remediation liabilities, in 2019 $ 26
Anticipated payments for currently identified environmental remediation liabilities, in 2020 19
Anticipated payments for currently identified environmental remediation liabilities, in 2021 65
Anticipated payments for currently identified environmental remediation liabilities, in 2022 37
Anticipated payments for currently identified environmental remediation liabilities, in 2023 13
Anticipated payments for currently identified environmental remediation liabilities, after 2023 $ 81