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Commitments and Contingencies - Quarter (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
site
item
Mar. 31, 2020
USD ($)
Dec. 31, 2020
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 $ 135    
Environmental remediation liabilities $ 218    
Number of sites listed on the EPA's NPL for which we have been notified we are a PRP | site 73    
Number of owned sites listed on the EPA's NPL for which we have been notified we are a PRP | site 14    
Number of non-owned sites listed on the EPA's NPL for which we have been notified we are a PRP | site 59    
Dollar threshold for environmental matters requiring disclosure under item 103 of the SEC's Regulation S-K $ 1    
Workforce covered by collective bargaining (as a percent) 20.00%    
Expected time of completion of IRS audits 24 months    
San Jacinto Waste Pits [Member]      
Commitments And Contingencies [Line Items]      
Environmental remediation liabilities $ 54   $ 55
Withdrawal from Multiemployer Pension Plans [Member]      
Commitments And Contingencies [Line Items]      
Charge to "Operating" expenses   $ 3  
$3.5 billion revolving credit facility [Member]      
Commitments And Contingencies [Line Items]      
Credit Facility, aggregate capacity $ 3,500