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Debt - Summary of Requirements of Financial Covenants Contained in Revolving Credit Facility (Detail)
 12 Months Ended 1 Months Ended
Dec. 31, 2014
Jul. 31, 2013
Minimum [Member]    
Debt Instrument Covenant Compliance [Line Items]    
The interest rate coverage ratio required to be maintained under the terms of the debt agreement 2.75wm_DebtInstrumentCovenantInterestCoverageRatio
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Maximum [Member]    
Debt Instrument Covenant Compliance [Line Items]    
Debt to EBITDA ratio 3.75wm_DebtInstrumentCovenantDebtToEbitdaRatio
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Maximum [Member] | Domestic Line of Credit [Member]    
Debt Instrument Covenant Compliance [Line Items]    
Debt to EBITDA ratio   3.50wm_DebtInstrumentCovenantDebtToEbitdaRatio
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_DomesticLineOfCreditMember
Maximum [Member] | Domestic Line of Credit [Member] | Quarters Ending Before September 30, 2015 [Member]    
Debt Instrument Covenant Compliance [Line Items]    
Debt to EBITDA ratio   3.75wm_DebtInstrumentCovenantDebtToEbitdaRatio
/ us-gaap_DebtSecurityAxis
= wm_DebtInstrumentCovenantPeriodOneMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_DomesticLineOfCreditMember
Effective date of covenant ratio requirements   Jul. 01, 2013
Maximum [Member] | Domestic Line of Credit [Member] | Quarter Ending September 30, 2015 Through Maturity in July 2018 [Member]    
Debt Instrument Covenant Compliance [Line Items]    
Debt to EBITDA ratio   3.50wm_DebtInstrumentCovenantDebtToEbitdaRatio
/ us-gaap_DebtSecurityAxis
= wm_DebtInstrumentCovenantPeriodTwoMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_DomesticLineOfCreditMember
Effective date of covenant ratio requirements   Jul. 01, 2015