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Asset Impairments and Unusual Items - Quarter (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Asset Impairments and Unusual Items |  |  |  |  |  |  |  |
(Gain) loss from divestitures, asset impairments and unusual items, net | $ 7 |  |  | $ 1 |  | $ 68 | $ 8 |
Asset impairments |  | $ 61 |  |  |  |  |  |
Investment impairment |  |  |  |  | $ 52 |  |  | $ 52
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 |  |  |  |  |  |
Energy Services Assets [Member] |  |  |  |  |  |  |  |
Asset Impairments and Unusual Items |  |  |  |  |  |  |  |
Asset fair value |  | 239 |  |  |  |  |  |
Energy Services Assets [Member] | Tier 1 [Member] |  |  |  |  |  |  |  |
Asset Impairments and Unusual Items |  |  |  |  |  |  |  |
Asset impairments |  | 41 |  |  |  |  |  |
Renewable Energy Assets [Member] |  |  |  |  |  |  |  |
Asset Impairments and Unusual Items |  |  |  |  |  |  |  |
Asset impairments | $ 7 |  |  |  |  |  |  |
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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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=121548190&loc=d3e32787-111569 + Details
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- Definition The aggregate amount of asset impairment charges, (gains) and losses related to the divestiture of businesses and unusual items incurred during an accounting period. + References No definition available. + Details
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