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Inventories, Net
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Inventories, Net
6. Inventories, Net

Inventories, net of reserves, by category were as follows:
 
Successor
 
 
Predecessor
 
December 31,
 
 
December 31,
(Dollars in millions)
2019
 
 
2018
Raw Materials, Components and Supplies
$
78

 
 
$
131

Work in Process
64

 
 
47

Finished Goods
830

 
 
847

 
$
972

 
 
$
1,025



During the 2019 Predecessor Period, and years ended December 31, 2018 and 2017, we recognized inventory write-off and other related charges, including excess and obsolete charges, totaling $159 million, $80 million and $540 million, respectively. These charges were largely attributable to the downturn in the oil and gas industry, where certain inventory has been deemed commercially unviable or technologically obsolete considering current and future demand.