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Asset Impairments and Unusual Items (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Divestitures |  |  |  |  |
(Gain) loss from divestitures, asset impairments and unusual items, net | $ 1 |  | $ 28 | $ 8 | $ (14)
Investment impairment |  | $ 52 |  |  |
Landfill [Member] |  |  |  |  |
Divestitures |  |  |  |  |
Asset impairments |  |  | $ 29 |  |
Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |
Divestitures |  |  |  |  |
(Gain) loss from divestitures, asset impairments and unusual items, net |  |  |  |  | (14)
Gain (loss) on sale of assets |  |  |  |  | $ 43

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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + 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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- Definition The amount by which the fair value of an investment is less than the carrying amount of that investment and the decline in fair value is deemed to be other than temporary. + References No definition available. + Details
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