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Acquisitions and Divestitures - Pro Forma (Detail) - Deffenbaugh Disposal Inc And Southern Waste Systems [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]    
Operating revenues $ 13,611 $ 13,137
Net income attributable to Waste Management, Inc. $ 1,182 $ 751
Basic earnings per common share $ 2.67 $ 1.66
Diluted earnings per common share $ 2.65 $ 1.65