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Acquisitions and Divestitures - ProForma Consolidated Results of Operations (Detail) (RCI Environnement Inc and Greenstar LLC [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
RCI Environnement Inc and Greenstar LLC [Member]
    
Business Acquisition [Line Items]    
Operating revenues $ 14,085us-gaap_BusinessAcquisitionsProFormaRevenue
/ dei_LegalEntityAxis
= wm_RciEnvironnementIncAndGreenstarLlcMember		 $ 14,009us-gaap_BusinessAcquisitionsProFormaRevenue
/ dei_LegalEntityAxis
= wm_RciEnvironnementIncAndGreenstarLlcMember
Net income attributable to Waste Management, Inc. $ 112us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ dei_LegalEntityAxis
= wm_RciEnvironnementIncAndGreenstarLlcMember		 $ 803us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ dei_LegalEntityAxis
= wm_RciEnvironnementIncAndGreenstarLlcMember
Basic earnings per common share $ 0.24us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ dei_LegalEntityAxis
= wm_RciEnvironnementIncAndGreenstarLlcMember		 $ 1.73us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ dei_LegalEntityAxis
= wm_RciEnvironnementIncAndGreenstarLlcMember
Diluted earnings per common share $ 0.24us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ dei_LegalEntityAxis
= wm_RciEnvironnementIncAndGreenstarLlcMember		 $ 1.73us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ dei_LegalEntityAxis
= wm_RciEnvironnementIncAndGreenstarLlcMember