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v3.20.4

Acquisitions and Divestitures (Detail) $ / shares in Units, customer in Millions, $ in Millions |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 30, 2020 USD ($) customer $ / shares | Mar. 08, 2019 item | Oct. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) item
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of business acquired | item |  |  |  |  | 4 | 18 | 32
Cash acquired from acquisitions |  |  |  |  | $ 36 |  |
Total consideration |  |  |  |  | 4,100 | $ 515 | $ 471
Business acquisitions cash payments |  |  |  |  |  | 501 | 440
Other consideration |  |  |  |  | 14 |  | 31
Payments made for contingent consideration |  |  |  |  |  | (6) |
Contingent consideration paid for acquisitions closed in previous year |  |  |  |  |  | 4 | 6
Purchase price holdbacks paid |  |  |  | $ 3 | 3 | 20 | 20
Purchase price holdbacks paid for acquisitions closed in current year |  |  |  |  |  | 9 | 15
Revenue |  |  |  |  | 15,218 | 15,455 | 14,914
Operating expenses |  |  |  |  | 9,341 | 9,496 | 9,249
Selling, general and administrative expenses |  |  |  |  | 1,728 | $ 1,631 | $ 1,453
364-day revolving credit facility [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Proceeds from Lines of Credit |  |  | $ 3,000 |  |  |  |
Advanced Disposal [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Total consideration | $ 4,600 |  |  |  |  |  |
Price per share | $ / shares | $ 30.30 |  |  |  |  |  |
Debt incurred for acquisition | $ 1,800 |  |  |  |  |  |
Number of customers | customer | 3 |  |  |  |  |  |
Business acquisition costs |  |  |  | 156 | $ 156 |  |
Revenue |  |  |  | 205 |  |  |
Operating expenses |  |  |  | 142 |  |  |
Selling, general and administrative expenses |  |  |  | $ 60 |  |  |
Petro Waste Environmental [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of landfills | item |  | 7 |  |  |  |  |

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