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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment The Company's major classes of property, plant, and equipment were as follows:
| As of December 31, |  | Depreciable
(In millions) | 2020 |  | 2019 |  | Lives
Facilities and equipment | $ | 3,365 |  |  | $ | 3,262 |  |  | 1-40 years
Land and improvements | 329 |  |  | 324 |  |  |
Nuclear fuel | 239 |  |  | 235 |  |  | 5 years
Hardware and office equipment and furnishings | 453 |  |  | 422 |  |  | 2-10 years
Construction in progress | 97 |  |  | 102 |  |  |
Total property, plant, and equipment | 4,483 |  |  | 4,345 |  |  |
Accumulated depreciation | (1,936) |  |  | (1,752) |  |  |
Net property, plant, and equipment | $ | 2,547 |  |  | $ | 2,593 |  |  |
The Company recorded long-lived asset impairments during the years ended December 31, 2020 and 2019, as further described in Note 11, Asset Impairments. Depreciation expense of property, plant and equipment recorded during the years ended 2020, 2019 and 2018 was $295 million, $271 million and $356 million, 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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