XML 66 R49.htm IDEA: XBRL DOCUMENT v3.22.4
Summary of Significant Accounting Policies - Landfill (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
site
item
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
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 $ 135    
Environmental remediation liabilities 204    
Environmental remediation liabilities not subject to inflation or discounting 31 $ 31  
Increase (decrease) in environmental remediation liabilities $ 10 $ (6)  
Landfill [Member]      
Significant accounting policies      
Inflation rate 2.50% 2.25% 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    
Risk-free discount rate applied to environmental remediation liabilities and recovery assets 3.75% 1.50% 1.00%
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 $ 204 $ 213  
Increase (decrease) in operating expenses $ (14) $ (4) $ 8
Risk-free discount rate applied to environmental remediation liabilities and recovery assets 3.75% 1.50% 1.00%