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Commitments and Contingencies (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Contingencies And Commitments [Line Items] |  |
Maximum self insurance exposures per incident under general liability insurance program | $ 5 |
Maximum self insurance exposures per incident under workers' compensation insurance program | 5 |
Per incident base deductible under auto liability insurance program | 10 |
Insurance claims receivable | 139 | $ 126
Beginning Balance | 575 | 567
Self-insurance expense | 172 | 171
Cash paid and other | (151) | (163)
Other | 68 |
Ending Balance | 664 | 575
Current portion | 175 | 145
Long-term portion | $ 489 | $ 430
Expected time period in years for cash settlement of recorded obligations associated with insurance liabilities | 6 years |
$3.5 billion 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
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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 exposures per incident under general liability insurance program. + References No definition available. + Details
Name: | wm_MaximumSelfInsuranceExposuresPerIncidentUnderGeneralLiabilityInsuranceProgram
Namespace Prefix: | wm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum self insurance exposures per incident under workers compensation insurance program. + References No definition available. + Details
Name: | wm_MaximumSelfInsuranceExposuresPerIncidentUnderWorkersCompensationInsuranceProgram
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: |