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Acquisitions and Divestitures - ProForma Consolidated Results of Operations (Detail) - Deffenbaugh Disposal, Inc. [Member] - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Business Acquisition [Line Items]      
Operating revenues $ 3,646 $ 9,755 $ 10,688
Net income attributable to Waste Management, Inc. $ 272 $ 480 $ 713
Basic earnings per common share $ 0.59 $ 1.06 $ 1.54
Diluted earnings per common share $ 0.59 $ 1.05 $ 1.53