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Quarterly Financial Data (Unaudited) - Summary (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Data |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 3,842 | $ 3,822 | $ 3,739 | $ 3,511 | $ 3,652 | $ 3,716 | $ 3,677 | $ 3,440 | $ 14,914 | $ 14,485 | $ 13,609
Income from operations | 767 | 699 | 715 | 608 | 704 | 701 | 673 | 558 | 2,789 | 2,636 | 2,296
Consolidated net income | 531 | 498 | 499 | 395 | 903 | 388 | 361 | 297 | 1,923 | 1,949 | 1,180
Net income attributable to Waste Management, Inc. | $ 531 | $ 499 | $ 499 | $ 396 | $ 903 | $ 386 | $ 362 | $ 298 | $ 1,925 | $ 1,949 | $ 1,182
Basic earnings per common share | $ 1.25 | $ 1.16 | $ 1.16 | $ 0.91 | $ 2.08 | $ 0.88 | $ 0.82 | $ 0.68 | $ 4.49 | $ 4.44 | $ 2.66
Diluted earnings per common share | $ 1.24 | $ 1.16 | $ 1.15 | $ 0.91 | $ 2.06 | $ 0.87 | $ 0.81 | $ 0.67 | $ 4.45 | $ 4.41 | $ 2.65

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