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Properties, Plants, and Equipment, Net
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Properties, Plants, and Equipment, Net Properties, Plants, and Equipment, Net
December 31, 2020December 31, 2019
Land and land rights$98 $99 
Structures1,033 938 
Machinery and equipment3,879 3,626 
5,010 4,663 
Less: accumulated depreciation and amortization2,626 2,449 
2,384 2,214 
Construction work-in-progress208 415 
Properties, plants, and equipment, net$2,592 $2,629 
During the second quarter of 2019, the Company updated its five-year strategic plan and determined that there was a decline in the forecasted financial performance for the Disks asset group within the Engineered Products and Forgings segment at that time. As such, the Company evaluated the recoverability of the Disks asset group long-lived assets by comparing the carrying value to the undiscounted cash flows of the Disks asset group. The carrying value exceeded the undiscounted cash flows and therefore the Disks asset group long-lived assets were deemed to be impaired. The impairment charge was measured as the amount of carrying value in excess of fair value of the long-lived assets, with fair value determined using a DCF model and a combination of sales comparison and cost approach valuation methods including an estimate for economic obsolescence. The impairment charge of $428, of which $247 and $181 related to the Engine Products and Engineered Structures segments, respectively, recorded in the second quarter of 2019 impacted properties, plants, and equipment; intangible assets; and certain other noncurrent assets by $198, $197, and $33, respectively. The impairment charge was recorded in Restructuring and other charges in the Statement of Consolidated Operations in 2019.Depreciation expense related to Properties, plants and equipment recorded in Provision for depreciation and amortization in the accompanying Statement of Consolidated Operations was $236, $234, and $253 for the years ended December 31, 2020, 2019 and 2018, respectively