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Acquisitions - ProForma Consolidated Results of Operations (Detail) - Deffenbaugh Disposal Inc And Southern Waste Systems [Member] - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Business Acquisition [Line Items]      
Operating revenues $ 3,350 $ 6,603 $ 6,461
Net income attributable to Waste Management, Inc. $ 274 $ 545 $ 144
Basic earnings per common share $ 0.60 $ 1.23 $ 0.31
Diluted earnings per common share $ 0.60 $ 1.22 $ 0.31