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Landfill and Environmental Costs - Environmental Remediation Liability (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Activity in environmental remediation liabilities    
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 adjustments 21 1
Environmental remediation liabilities, end of period 450 454
Less: current portion (60) (63)
Long-term portion $ 390 $ 391