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Commitments and Contingencies - Other (Details) | 2 Months Ended | 3 Months Ended | 12 Months Ended
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Jan. 31, 2011 item | Sep. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) site item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |
Approximate number of homeowners' properties adjacent to or near certain of our landfills with agreements guaranteeing market value | item |  |  | 775 |  |
Number of landfills adjacent to or near homeowners' properties with agreements guaranteeing market value | item |  |  | 19 |  |
Environmental remediation liabilities |  |  | $ 237,000,000 |  |
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 |  | $ 11,000,000 | $ 3,000,000 | $ 12,000,000 |
San Jacinto Waste Pits [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Environmental remediation liabilities |  |  | 55,000,000 | 55,000,000 |
Revisions in estimate |  | $ 9,000,000 |  | $ 11,000,000 | $ 44,000,000
Waimanalo Gulch Sanitary Landfill |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Number of major rainfalls | item | 2 |  |  |  |
Wheelabrator [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Maximum future payments |  |  | $ 85,000,000 |  |

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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://www.xbrl.org/2003/role/presentationRef -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 Approximate number of homeowners properties adjacent to or near certain of our landfills with agreements guaranteeing market value. + References No definition available. + Details
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- Definition Number of non-owned sites listed on the environmental protection agency's national priorities list for which we have been notified we are a PRP. + References No definition available. + Details
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