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Landfill and Environmental Remediation Liabilities - Summary (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Landfill and environmental remediation liabilities    
Total, Environmental Remediation $ 220  
Current (in accrued liabilities) 155 $ 164
Long-term 2,299 2,222
Total 2,454 2,386
Landfill [Member]    
Landfill and environmental remediation liabilities    
Current (in accrued liabilities), Landfill 129 138
Long-term, Landfill 2,105 2,018
Total, Landfill 2,234 2,156
Environmental Remediation Liabilities [Member]    
Landfill and environmental remediation liabilities    
Current (in accrued liabilities), Environmental Remediation 26 26
Long-term, Environmental Remediation 194 204
Total, Environmental Remediation $ 220 $ 230