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Asset Impairments and Unusual Items (Tables) | 12 Months Ended
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Dec. 31, 2019
Asset Impairments and Unusual Items |
Summary of the major components of (gain) loss from divestitures, asset impairments and unusual items, net | The following table summarizes the major components of (gain) loss from divestitures, asset impairments and unusual items, net for the years ended December 31 (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017
(Gain) loss from divestitures | ​ | $ | — | ​ | $ | (96) | ​ | $ | (38)
Asset impairments | ​ |  | 42 | ​ |  | 38 | ​ |  | 41
Other | ​ |  | — | ​ |  | — | ​ |  | (19)
​ | ​ | $ | 42 | ​ | $ | (58) | ​ | $ | (16)

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- Definition Tabular disclosure of the nature and financial statement effect of an event or transaction that is unusual in nature or infrequent in occurrence, or both. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=114868883&loc=SL114871943-224233 + Details
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