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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Pland and Equipment with Useful Life Classification | The 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.
|  |  | December 31,
| Estimated Useful Life | 2018 |  | 2017
Electric generation and distribution facilities | 7-40 |  | $ | 22,875 |  |  | $ | 21,529 |
Other buildings | 5-72 |  | 1,651 |  |  | 1,971 |
Furniture, fixtures and equipment | 3-25 |  | 310 |  |  | 284 |
Other | 5-44 |  | 406 |  |  | 335 |
Total electric generation and distribution assets and other |  |  | 25,242 |  |  | 24,119 |
Accumulated depreciation |  |  | (8,227 | ) |  | (7,942 | )
Net electric generation and distribution assets and other |  |  | $ | 17,015 |  |  | $ | 16,177 |
Interest Capitalized During Development And Construction | The following table summarizes depreciation expense (including the amortization of assets recorded under capital leases 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, |  | 2018 |  | 2017 |  | 2016
Depreciation expense |  | $ | 960 |  |  | $ | 1,005 |  |  | $ | 1,002 |
Interest capitalized during development and construction |  | 199 |  |  | 139 |  |  | 118 |
Net Asset Value Of Regulated And Non-Regulated Assets And Accumulated Depreciation | 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, |  | 2018 |  | 2017
Regulated generation, distribution assets and other, gross |  | $ | 8,959 |  |  | $ | 8,093 |
Regulated accumulated depreciation |  | (3,504 | ) |  | (3,357 | )
Regulated generation, distribution assets and other, net |  | 5,455 |  |  | 4,736 |
Non-regulated generation, distribution assets and other, gross |  | 16,283 |  |  | 16,026 |
Non-regulated accumulated depreciation |  | (4,723 | ) |  | (4,585 | )
Non-regulated generation, distribution assets and other, net |  | 11,560 |  |  | 11,441 |
Net electric generation, distribution assets and other |  | $ | 17,015 |  |  | $ | 16,177 |
Schedule of Change in Asset Retirement Obligation | The following table presents amounts recognized related to asset retirement obligations for the periods indicated (in millions):
|  | 2018 |  | 2017
Balance at January 1 |  | $ | 368 |  |  | $ | 357 |
Additional liabilities incurred |  | 19 |  |  | 1 |
Liabilities settled |  | (14 | ) |  | (21 | )
Accretion expense |  | 18 |  |  | 16 |
Change in estimated cash flows |  | 24 |  |  | 25 |
Other |  | — |  |  | (10 | )
Balance at December 31 |  | $ | 415 |  |  | $ | 368 |

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- Definition Summary of regulated and non-regulated generation and distribution facilities property, plant and equipment and associated accumulated depreciation + References No definition available. + Details
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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=6877327&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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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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