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

X

- 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

X

- 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

X

- Details

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