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Commitments and Contingencies (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Contingencies And Commitments [Line Items] |  |
Maximum self insurance exposure per incident under general liability insurance and workers' compensation insurance programs | $ 5 |
Per incident base deductible under auto liability insurance program | 10 |
Insurance claims receivable | 155 | $ 139
Beginning Balance | 664 | 575
Self-insurance expense | 240 | 172
Cash paid and other | (170) | (151)
Other |  | 68
Ending Balance | 734 | 664
Current portion | 191 | 175
Long-term portion | $ 543 | 489
Expected time period in years for cash settlement of recorded obligations associated with insurance liabilities | 6 years |
Revolving Credit Facility [Member] |  |
Contingencies And Commitments [Line Items] |  |
Credit Facility, aggregate capacity | $ 3,500 |
Advanced Disposal [Member] |  |
Contingencies And Commitments [Line Items] |  |
Other |  | $ 68

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- Definition Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. + References No definition available. + Details
Name: | us-gaap_InsuranceSettlementsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Cash (paid) received. + References No definition available. + Details
Name: | wm_CashPaidReceived
Namespace Prefix: | wm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Contingencies And Commitments [Line Items] + References No definition available. + Details
Name: | wm_ContingenciesAndCommitmentsLineItems
Namespace Prefix: | wm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Expected time period in years for cash settlement of recorded obligations associated with insurance liabilities. + References No definition available. + Details
Name: | wm_ExpectedTimePeriodInTermsForCashSettlementOfRecordedObligationsAssociatedWithInsuranceLiabilities
Namespace Prefix: | wm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Gross insurance claims liability + References No definition available. + Details
Name: | wm_GrossInsuranceClaimsLiability
Namespace Prefix: | wm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Gross insurance claims liability current. + References No definition available. + Details
Name: | wm_GrossInsuranceClaimsLiabilityCurrent
Namespace Prefix: | wm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Net insurance claims liability noncurrent. + References No definition available. + Details
Name: | wm_GrossInsuranceClaimsLiabilityNoncurrent
Namespace Prefix: | wm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum self insurance exposure per incident under general liability insurance program and workers' compensation insurance program. + References No definition available. + Details
Name: | wm_MaximumSelfInsuranceExposuresPerIncidentUnderGeneralLiabilityInsuranceAndWorkersCompensationInsurancePrograms
Namespace Prefix: | wm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of other insurance reserve increase or decrease. + References No definition available. + Details
Name: | wm_OtherInsuranceReserveIncreaseDecrease
Namespace Prefix: | wm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Per incident base deductible under auto liability insurance program. + References No definition available. + Details
Name: | wm_PerIncidentBaseDeductibleUnderAutoLiabilityInsuranceProgram
Namespace Prefix: | wm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Self insurance expense benefit. + References No definition available. + Details
Name: | wm_SelfInsuranceExpenseBenefit
Namespace Prefix: | wm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentAxis=wm_CreditFacilityRevolvingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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