Commitments and Contingencies - Other (Details)	12 Months Ended
	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