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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
Mar. 31, 2016
Mar. 31, 2015
Business Acquisition [Line Items]    
Operating revenues $ 3,178 $ 3,111
Net income (loss) attributable to Waste Management, Inc. $ 258 $ (130)
Basic earnings (loss) per common share $ 0.58 $ (0.28)
Diluted earnings (loss) per common share $ 0.58 $ (0.28)