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Landfill and Environmental Costs - Accrued Landfill and Environmental Costs (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Environmental Remediation Obligations [Abstract]        
Landfill final capping, closure and post-closure liabilities $ 2,253 $ 2,144 $ 2,034 $ 1,937
Environmental remediation 450 447 $ 454 $ 485
Total accrued landfill and environmental costs 2,703 2,591    
Less: current portion (145) (159)    
Long-term portion $ 2,558 $ 2,432