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Other Property and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Summary of other property and equipment held for use and estimated useful lives | A summary of other property and equipment held for use and the estimated useful lives thereof is as follows:
|  | December 31, |  | Estimated Useful Life
|  | 2020 |  | 2019 |
|  | ($ in millions) |  | (in years)
Buildings and improvements |  | $ | 1,038 |  |  | $ | 1,058 |  |  | 10 – 39
Computer equipment |  | 356 |  |  | 355 |  |  | 5
Sand mine |  | 81 |  |  | 78 |  |  | 10 – 30
Natural gas compressors(a) |  | 36 |  |  | 48 |  |  | 3 – 20
Land |  | 113 |  |  | 115 |  |  |
Other |  | 130 |  |  | 156 |  |  | 5 – 20
Total other property and equipment, at cost |  | 1,754 |  |  | 1,810 |  |  |
Less: accumulated depreciation |  | (799) |  |  | (692) |  |  |
Total other property and equipment, net |  | $ | 955 |  |  | $ | 1,118 |  |  |
___________________________________________ (a) Includes assets under finance lease of $27 million, less accumulated depreciation of $18 million and $10 million, as of December 31, 2020 and 2019, respectively. The related amortization expense for assets under finance lease is included in depreciation, depletion and amortization expense on our consolidated statement of operations.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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