Segment and Related Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2025 facility project
Collection and Disposal [Member]
Segment Reporting
Number of third-party power generating facilities \| facility	19
Number of third-party RNG facilities \| facility	17
Number of third-party projects delivering landfill gas by pipeline	9
Renewable Energy [Member]
Segment Reporting
Number of landfill beneficial use renewable energy projects	86
Total number of landfill beneficial use renewable energy projects	103
Number of landfill beneficial use renewable energy projects used to produce methane gas to fuel electricity generators	62
Number of landfill beneficial use renewable energy projects used to produce methane gas as a fossil fuel substitute	24
Number of landfill beneficial use renewable energy projects used to produce methane gas as pipeline quality RNG	17
Number of projects on third-party landfills	3
Number of landfill beneficial use renewable energy projects in return for service revenue	6
Number of landfill beneficial use renewable energy projects in the form of royalties	54
Number of landfill beneficial use renewable energy projects on closed sites	17
Healthcare Solutions [Member]
Segment Reporting
Number of leased and owned facilities \| facility	307
Number of autoclaves or other alternative medical waste treatment facilities \| facility	51
Number of medical waste incinerator facilities \| facility	17
Number of SID processing facilities \| facility	99
Number of transfer stations \| facility	140
Corporate and Other [Member]
Segment Reporting
Number of landfill beneficial use renewable energy projects used to produce methane gas to fuel electricity generators \| facility	5
Number of landfill beneficial use renewable energy projects used to produce methane gas as a fossil fuel substitute	2
Number of landfill beneficial use renewable energy projects used to produce methane gas as pipeline quality RNG \| facility	2

WASTE MANAGEMENT INC 10-K