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Commitments and Contingencies - Quarter (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) site item | Dec. 31, 2019 USD ($)
Commitments And Contingencies [Line Items] |  |  |
Number of landfills adjacent to or near homeowners' properties with agreements guaranteeing market value | item |  | 18 |
Environmental remediation reasonably possible additional losses high estimate |  | $ 145,000,000 |
Environmental remediation liabilities |  | $ 238,000,000 |
Number of sites listed on the EPA's NPL for which we have been notified we are a PRP | site |  | 75 |
Number of owned sites listed on the EPA's NPL for which we have been notified we are a PRP | site |  | 15 |
Number of non-owned sites listed on the EPA's NPL for which we have been notified we are a PRP | site |  | 60 |
Dollar threshold for environmental matters requiring disclosure under item 103 of the SEC's Regulation S-K |  | $ 100,000 |
Approximate percentage of workforce covered by collective bargaining agreements |  | 20.00% |
Expected time of completion of IRS audits |  | 18 months |
San Jacinto Waste Pits [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Environmental remediation liabilities |  | $ 55,000,000 | $ 56,000,000
Withdrawal from Multiemployer Pension Plans [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Charge to "Operating" expenses | $ 3,000,000 |  |
$3.5 billion revolving credit facility [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Credit Facility, aggregate capacity |  | $ 3,500,000,000 |

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