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