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Commitments and Contingencies - Other (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) site item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 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 | $ 140,000,000 |  |
Environmental remediation liabilities | $ 240,000,000 |  |
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 | 15 months |  |
Withdrawal from Multiemployer Pension Plans [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Charge to "Operating" expenses |  | $ 3,000,000 | $ 12,000,000
Maximum [Member] | Withdrawal from Multiemployer Pension Plans [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Charge to "Operating" expenses | $ 1,000,000 |  |
San Jacinto Waste Pits [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Environmental remediation liabilities | 56,000,000 | $ 55,000,000 |
Revisions in estimate |  |  | $ 11,000,000
Wheelabrator [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Maximum future payments | $ 45,000,000 |  |

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- Definition Amount of expense (reversal of expense) which increases (decreases) the accrual for environmental loss contingencies from revisions in estimates to existing obligations. Excludes changes related to business acquisitions, divestitures, or currency movement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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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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- Definition Maximum number of months expected for IRS audits to be completed. + References No definition available. + Details
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- Definition Number of landfills adjacent to or near homeowners properties with agreements guaranteeing market value. + References No definition available. + Details
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