Commitments and Contingencies - Quarter (Details)	9 Months Ended
	Sep. 30, 2019 USD ($) site item	Dec. 31, 2018 USD ($)
Commitments And Contingencies [Line Items]
Approximate number of homeowners' properties adjacent to or near certain of our landfills with agreements guaranteeing market value | item	850
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	$ 239,000,000
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	18 months
San Jacinto Waste Pits [Member]
Commitments And Contingencies [Line Items]
Environmental remediation liabilities	$ 56,000,000	$ 55,000,000
Wheelabrator [Member]
Commitments And Contingencies [Line Items]
Maximum future payments	57,000,000
Revolving Credit Facility [Member]
Commitments And Contingencies [Line Items]
Credit Facility, aggregate capacity	$ 2,750,000,000