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Acquisitions - Petro Waste Environmental (Detail) | Mar. 08, 2019 item
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Petro Waste Environmental [Member] |
Business Acquisition [Line Items] |
Number of landfills | 7

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of landfills. + References No definition available. + Details
Name: | wm_NumberOfLandfills
Namespace Prefix: | wm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=wm_PetroWasteEnvironmentalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |