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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
Extractive Industries [Abstract] |
Property, Plant and Equipment | 13.Property, Plant and Equipment Capitalized Costs The following table reflects the aggregate capitalized costs related to Devon’s oil and gas and non-oil and gas activities.
|  | December 31, 2020 |  |  | December 31, 2019 |
Property and equipment: |  |  |  |  |  |  |  |
Proved |  | $ | 27,589 |  |  | $ | 27,668 |
Unproved and properties under development |  |  | 392 |  |  |  | 583 |
Total oil and gas |  |  | 27,981 |  |  |  | 28,251 |
Less accumulated DD&A |  |  | (23,545 | ) |  |  | (20,693 | )
Oil and gas property and equipment, net |  |  | 4,436 |  |  |  | 7,558 |
Other property and equipment |  |  | 1,737 |  |  |  | 1,725 |
Less accumulated DD&A |  |  | (780 | ) |  |  | (690 | )
Other property and equipment, net (1) |  |  | 957 |  |  |  | 1,035 |
Property and equipment, net |  | $ | 5,393 |  |  | $ | 8,593 |
(1) | $102 million and $80 million related to CDM in 2020 and 2019, respectively.
During 2020, Devon recognized asset impairments of $2.7 billion primarily related to proved oil and gas assets and $152 million of unproved impairments, which significantly reduced the carrying value of its property and equipment, net. See Note 5 for additional details. Suspended Exploratory Well Costs The following summarizes the changes in suspended exploratory well costs for the three years ended December 31, 2020.
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  |  | 2018 |  |
Beginning balance |  | $ | 82 |  | $ | 98 |  |  | $ | 100 |  |
Additions pending determination of proved reserves |  |  | 148 |  |  | 278 |  |  |  | 658 |  |
Charges to exploration expense |  |  | (3 | ) |  | — |  |  |  | — |  |
Reclassifications to proved properties |  |  | (209 | ) |  | (294 | ) |  |  | (660 | ) |
Ending balance |  | $ | 18 |  | $ | 82 |  |  | $ | 98 |  |
Devon had no projects with suspended exploratory well costs capitalized for a period greater than one year since the completion of drilling as of December 31, 2020, 2019 and 2018, respectively.

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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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