Summary of Significant Accounting Policies - Landfill (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) item site	Dec. 31, 2022 USD ($)	Dec. 31, 2021
Significant accounting policies
Number of expansion landfill sites require CFO approval inclusion of unpermitted airspace | item	2
Environmental remediation reasonably possible additional losses high estimate	$ 85
Environmental remediation liabilities	$ 209
Landfill [Member]
Significant accounting policies
Inflation rate	2.50%	2.50%	2.25%
Credit adjusted, risk free discount rate applicable to long-term asset retirement obligations	4.80%
Number of landfills sites with expansion | site	16
Landfill [Member] | Minimum [Member]
Significant accounting policies
Permit application process period requirement	1 year
Landfill [Member] | Maximum [Member]
Significant accounting policies
Permit application process period requirement	5 years
Accounts Receivable Net [Member] | Concentration of Credit Risk [Member]
Significant accounting policies
Concentration of risk threshold (as a percent)	5.00%	5.00%
Environmental Remediation Liabilities [Member]
Significant accounting policies
Environmental remediation liabilities	$ 209	$ 204