Landfill and Environmental Remediation Liabilities - Changes (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Landfill and environmental remediation liabilities
Interest accretion	$ 75	$ 72
Ending balance, environmental remediation	238
Advanced Disposal [Member]
Landfill and environmental remediation liabilities
Acquisitions, divestitures and other adjustments	(17)
Landfill [Member]
Landfill and environmental remediation liabilities
Beginning balance, landfill	1,855
Obligations incurred and capitalized	61
Obligations settled	(75)
Interest accretion	75
Revisions in estimates and interest rate assumptions	30
Acquisitions, divestitures and other adjustments	(18)
Ending balance, landfill	1,928
Asset retirement obligation revision of estimate increase (decrease) related to estimated capping activities	10
Asset retirement obligation, increase (decrease) related to landfill closure	8
Environmental Remediation Liabilities [Member]
Landfill and environmental remediation liabilities
Beginning balance, environmental remediation	240
Obligations settled	(17)
Interest accretion	1
Revisions in estimates and interest rate assumptions	14
Ending balance, environmental remediation	238
Increase (decrease) operating expenses due to change in discount rate	$ 12
Risk-free discount rate of the obligations	0.75%		1.75%