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Commitments and Contingencies - Quarter (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) 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 |  | $ 242,000,000 |
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 |  | 21 months |
San Jacinto Waste Pits [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Environmental remediation liabilities |  |  | $ 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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- Definition Percentage of employee participants subject to a collective bargaining arrangement to all participants in a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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