Fair Value Measurements - Debt (Detail) - USD ($) $ in Billions	Sep. 30, 2025	Dec. 31, 2024
Reported Value Measurement [Member]
Fair Value
Fair value of debt	$ 23.4	$ 23.9
Significant Other Observable Inputs (Level 2) [Member] \| Estimate of Fair Value Measurement [Member]
Fair Value
Fair value of debt	$ 23.0	$ 22.9

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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WASTE MANAGEMENT INC 10-Q