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Acquisitions and Divestitures - Pro Forma (Detail) - Advanced Disposal [Member] $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) $ / shares shares
Business Acquisition |
Operating revenues | $ | $ 16,192
Net income attributable to Waste Management, Inc. | $ | $ 1,685
Basic earnings per common share | $ / shares | $ 3.99
Diluted earnings per common share | $ / shares | $ 3.96
Basic (in shares) | shares | 423
Diluted (in shares) | shares | 425

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