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Other Property and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Other Property and Equipment | Other Property and Equipment Other Property and Equipment 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 The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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