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Property, Plants, and Equipment, Net | 9 Months Ended
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Sep. 30, 2018
Property, Plant and Equipment [Abstract] |
Properties, Plants, and Equipment, Net | Properties, Plants, and Equipment, Net
| September 30, 2018 |  | December 31, 2017
Land and land rights | $ | 138 |  |  | $ | 140 |
Structures | 2,374 |  |  | 2,395 |
Machinery and equipment | 9,244 |  |  | 8,830 |
| 11,756 |  |  | 11,365 |
Less: accumulated depreciation and amortization | 6,778 |  |  | 6,392 |
| 4,978 |  |  | 4,973 |
Construction work-in-progress | 667 |  |  | 621 |
| $ | 5,645 |  |  | $ | 5,594 |
During the second quarter of 2018, the Company updated its three-year strategic plan and determined that there was a decline in the forecasted financial performance for the disks operations, an asset group within the Arconic Engines business unit. As such, the Company evaluated the recoverability of the long-lived assets by comparing their carrying value of approximately $515 to the estimated undiscounted net cash flows of the disks operations, resulting in an estimated fair value in excess of their carrying value of approximately 13%; thus, there was no impairment. If the disks operations do not achieve the revised forecasted financial performance or if there are changes in any significant assumptions, a material non-cash impairment of long-lived assets may occur in future periods. These significant assumptions include sales growth, cost of raw materials, ramp up of additional production capacity, and working capital. A 1% decrease in the forecasted net cash flows would reduce the undiscounted cash flows by approximately $6. There were no indicators of impairment identified for the disks operations during the third quarter of 2018 and, as such, the Company did not evaluate the recoverability of its long-lived assets. The Company also performed an interim impairment evaluation of goodwill in the second quarter of 2018 for the Arconic Engines reporting unit as a result of the decline in the forecasted performance of the disks operations as noted above. The estimated fair value of the reporting unit was substantially in excess of the carrying value; thus, there was no impairment of goodwill.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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