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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 EQUIPMENTThe following table summarizes the components of the electric generation and distribution assets and other property, plant and equipment (in millions) with their estimated useful lives (in years). The amounts are stated net of all prior asset impairment losses recognized.
| Estimated Useful Life |  | December 31,
| (in years) | 2020 |  | 2019
Electric generation and distribution facilities | 5-40 |  | $ | 24,239 |  |  | $ | 22,869 |
Other buildings | 5-51 |  | 1,507 |  |  | 1,612 |
Furniture, fixtures and equipment | 3-30 |  | 333 |  |  | 319 |
Other | 5-39 |  | 628 |  |  | 583 |
Total electric generation and distribution assets and other |  |  | 26,707 |  |  | 25,383 |
Accumulated depreciation |  |  | (8,472) |  |  | (8,505) |
Net electric generation and distribution assets and other |  |  | $ | 18,235 |  |  | $ | 16,878 |
The following table summarizes depreciation expense (including the amortization of assets recorded under finance leases in 2020 and 2019 or capital leases in 2018, and the amortization of asset retirement obligations) and interest capitalized during development and construction on qualifying assets for the periods indicated (in millions):
Years Ended December 31, |  | 2020 |  | 2019 |  | 2018
Depreciation expense |  | $ | 1,004 |  |  | $ | 977 |  |  | $ | 960 |
Interest capitalized during development and construction |  | 307 |  |  | 238 |  |  | 199 |
Property, plant and equipment, net of accumulated depreciation, of $10 billion was mortgaged, pledged or subject to liens as of December 31, 2020 and 2019, including assets classified as held-for-sale. The following table summarizes regulated and non-regulated generation and distribution property, plant and equipment and accumulated depreciation as of the dates indicated (in millions):
December 31, |  | 2020 |  | 2019
Regulated generation and distribution assets and other, gross |  | $ | 8,858 |  |  | $ | 8,570 |
Regulated accumulated depreciation |  | (3,329) |  |  | (3,029) |
Regulated generation and distribution assets and other, net |  | 5,529 |  |  | 5,541 |
Non-regulated generation and distribution assets and other, gross |  | 17,849 |  |  | 16,813 |
Non-regulated accumulated depreciation |  | (5,143) |  |  | (5,476) |
Non-regulated generation and distribution assets and other, net |  | 12,706 |  |  | 11,337 |
Net electric generation and distribution assets and other |  | $ | 18,235 |  |  | $ | 16,878 |

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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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