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Acquisitions and Divestitures - ProForma Consolidated Results of Operations (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deffenbaugh Disposal, Inc. [Member]      
Business Acquisition [Line Items]      
Operating revenues $ 13,001 $ 14,168  
Net income attributable to Waste Management, Inc. $ 753 $ 1,304  
Basic earnings per common share $ 1.66 $ 2.82  
Diluted earnings per common share $ 1.65 $ 2.80  
RCI Environnement, Inc and Greenstar LLC [Member]      
Business Acquisition [Line Items]      
Operating revenues     $ 14,085
Net income attributable to Waste Management, Inc.     $ 112
Basic earnings per common share     $ 0.24
Diluted earnings per common share     $ 0.24