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Acquisitions and Assets Held-for-Sale (Detail) $ / shares in Units, customer in Millions, $ in Millions | Oct. 30, 2020 customer state | Jun. 24, 2020 USD ($) $ / shares | Apr. 14, 2019 USD ($) $ / shares | Mar. 08, 2019 item | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 6,504 | $ 6,532
Advanced Disposal [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Price per share | $ / shares |  | $ 30.30 | $ 33.15 |  |  |
Total enterprise value |  | $ 4,600 | $ 4,900 |  |  |
Total debt assumed |  | $ 1,800 | $ 1,900 |  |  |
Number of customers | customer | 3 |  |  |  |  |
Number of states | state | 16 |  |  |  |  |
Petro Waste Environmental [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of landfills | item |  |  |  | 7 |  |

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