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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2017
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
| 2017 |  | 2016 |  | Lives
| (In millions) |  |
Facilities and equipment | $ | 15,907 |  |  | $ | 18,698 |  |  | 1-40 Years
Land and improvements | 710 |  |  | 750 |  |  |
Nuclear fuel | 236 |  |  | 226 |  |  | 5 Years
Office furnishings and equipment | 434 |  |  | 412 |  |  | 2-10 Years
Construction in progress | 1,086 |  |  | 619 |  |  |
Total property, plant, and equipment | 18,373 |  |  | 20,705 |  |  |
Accumulated depreciation | (4,465 | ) |  | (5,336 | ) |  |
Net property, plant, and equipment | $ | 13,908 |  |  | $ | 15,369 |  |  |
The Company recorded long-lived asset impairments during the years ended December 31, 2017 and 2016, as further described in Note 10, Asset Impairments.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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