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Impairments | 12 Months Ended
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Dec. 31, 2019
Asset Impairment Charges [Abstract] |
Impairments | Impairments Impairments of Oil and Natural Gas Properties A summary of our impairments of oil and natural gas properties for the years ended December 31, 2019, 2018 and 2017 is as follows:
|  | Years Ended December 31,
|  | 2019 |  | 2018 |  | 2017
|  | ($ in millions)
Impairments due to lower forecasted commodity prices |  | $ | 8 |  |  | $ | 23 |  |  | $ | 27 |
Impairments due to reduction in future development(a) |  | — |  |  | — |  |  | 560 |
Impairments due to anticipated sale |  | — |  |  | 55 |  |  | 222 |
Total impairments of oil and natural gas properties |  | $ | 8 |  |  | $ | 78 |  |  | $ | 809 |
____________________________________________
(a) | The impairment was the result of an updated development plan in 2017, which included a removal of PUDs from properties in the process of being divested in the Mid-Continent operating area.
Impairments of Fixed Assets A summary of our impairments of fixed assets by asset class and other charges for the years ended December 31, 2019, 2018 and 2017 is as follows:
|  | Years Ended December 31,
|  | 2019 |  | 2018 |  | 2017
|  | ($ in millions)
Natural gas compressors(a) |  | $ | — |  |  | $ | 45 |  |  | $ | — |
Buildings and land |  | 1 |  |  | 4 |  |  | 5 |
Other |  | 2 |  |  | 4 |  |  | — |
Total impairments of fixed assets and other |  | $ | 3 |  |  | $ | 53 |  |  | $ | 5 |
____________________________________________ (a) In 2018, we recorded a $45 million impairment related to 890 compressors for the difference between carrying value and the fair value of the assets.

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- Definition The entire disclosure for the details of the charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. Disclosure may also include a description of the impaired asset and facts and circumstances leading to the impairment, amount of the impairment loss and where the loss is located in the income statement, method(s) for determining fair value, and the segment in which the impaired asset is reported. + References No definition available. + Details
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