Properties, Plants, and Equipment, Net

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]



December 31,	2018		2017
Land and land rights	$	136	$	140
Structures:
Engineered Products and Solutions	796		784
Global Rolled Products	1,068		1,090
Transportation and Construction Solutions	248		268
Other	252		253
	2,364		2,395
Machinery and equipment:
Engineered Products and Solutions	3,437		3,054
Global Rolled Products	4,629		4,641
Transportation and Construction Solutions	748		777
Other	420		358
	9,234		8,830
	11,734		11,365
Less: accumulated depreciation and amortization	6,769		6,392
	4,965		4,973
Construction work-in-progress	739		621
	$	5,704	$	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 or fourth quarters of 2018 and, as such, the Company did not evaluate the recoverability of its long-lived assets.