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Landfill and Environmental Costs (Tables)
 9 Months Ended
Sep. 30, 2025
Environmental Remediation Obligations [Abstract]  
Schedule of Accrued Landfill and Environmental Costs
A summary of accrued landfill and environmental liabilities as of September 30, 2025 and December 31, 2024 follows:
20252024
Landfill final capping, closure and post-closure liabilities$2,253 $2,144 
Environmental remediation450 447 
Total accrued landfill and environmental costs2,703 2,591 
Less: current portion(145)(159)
Long-term portion$2,558 $2,432 
Schedule of Final Capping, Closure and Post-Closure Costs
The following table summarizes the activity in our asset retirement obligation liabilities, which includes liabilities for final capping, closure and post-closure, for the nine months ended September 30, 2025 and 2024:
20252024
Asset retirement obligation liabilities, beginning of year$2,144 $1,937 
Non-cash additions57 45 
Acquisitions, net of divestitures and other adjustments1 4 
Asset retirement obligation adjustments4 3 
Payments(38)(35)
Accretion expense85 80 
Asset retirement obligation liabilities, end of period2,253 2,034 
Less: current portion(85)(78)
Long-term portion$2,168 $1,956 
Schedule of Activity in Environmental Remediation Liabilities
The following table summarizes the activity in our environmental remediation liabilities for the nine months ended September 30, 2025 and 2024:
20252024
Environmental remediation liabilities, beginning of year$447 $485 
Payments(31)(45)
Accretion expense (non-cash interest expense)13 13 
Acquisitions, net of divestitures and other adjustments21 1 
Environmental remediation liabilities, end of period450 454 
Less: current portion(60)(63)
Long-term portion$390 $391