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Asset Impairments and Unusual Items (Tables) | 12 Months Ended
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Dec. 31, 2020
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 year ended December 31 (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Gain from divestitures, net | ​ | $ | (33) | ​ | $ | — | ​ | $ | (96)
Asset impairments | ​ |  | 68 | ​ |  | 42 | ​ |  | 38
​ | ​ | $ | 35 | ​ | $ | 42 | ​ | $ | (58)

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