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Divestitures, Asset Impairments and Unusual Items (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Asset Impairments and Unusual Items |  |  |  |  |
(Gain) loss from divestitures, asset impairments and unusual items, net | $ 17 | $ 61 |  | $ 17 | $ 61
Increase in legal accruals | 19 |  |  |  |
Asset impairments | 6 | 61 |  |  | 61
Gain (loss) on sale of assets | $ 8 |  |  |  |
Refined Coal Facility [Member] |  |  |  |  |
Asset Impairments and Unusual Items |  |  |  |  |
Equity method investments impairment charges |  |  | $ 7 |  | 7
Landfills and Oil Field Waste Injection Facility [Member] |  |  |  |  |
Asset Impairments and Unusual Items |  |  |  |  |
Asset impairments |  | 41 |  |  |
Asset fair value |  | 8 |  |  | $ 8
Landfill [Member] |  |  |  |  |
Asset Impairments and Unusual Items |  |  |  |  |
Asset impairments |  | 20 |  |  |
Landfill [Member] | Carrying Value [Member] |  |  |  |  |
Asset Impairments and Unusual Items |  |  |  |  |
Asset impairments |  | 12 |  |  |
Landfill [Member] | Expected Timing [Member] |  |  |  |  |
Asset Impairments and Unusual Items |  |  |  |  |
Asset impairments |  | $ 8 |  |  |

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