6. RESTRUCTURING, IMPAIRMENT AND PLANT CLOSING COSTS 

As of  June 30, 2023 and December 31, 2022, accrued restructuring costs by type of cost consisted of the following (dollars in millions):

Details with respect to our reserves for restructuring, impairment and plant closing costs by segment are provided below (dollars in millions):

Details with respect to cash and noncash restructuring charges from continuing operations for the three and six months ended June 30, 2023 and 2022 are provided below (dollars in millions):

Restructuring Activities

Beginning in the fourth quarter of 2022, we implemented a restructuring program to further realign our cost structure with additional restructuring in Europe. This program is associated with all of our segments and includes exiting and consolidating certain facilities, workforce relocation to lower cost locations and further personnel rationalization. During the first half of 2023, we evaluated current developments of this program and related anticipated cash costs, and we recorded a net restructuring credit of approximately $3 million for the six months ended June 30, 2023, primarily to adjust restructuring reserves that are no longer required for certain workforce reductions. We expect to record further restructuring expenses of approximately $12 million through the first half of 2024.

Beginning in the first quarter of 2021, our Corporate function implemented a restructuring program to optimize our global approach to leveraging shared services capabilities. During the second quarter of 2022, this program was further expanded to include additional geographies. During the first half of 2023, we evaluated current developments of this program and related anticipated cash costs, and we recorded a net restructuring credit of approximately $5 million for the six months ended June 30, 2023, primarily to adjust restructuring reserves that are no longer required for certain workforce reductions. During the six months ended  June 30, 2022, we recorded approximately $17 million of net restructuring costs, primarily related to workforce reductions. We expect to record further restructuring expenses of approximately $2 million through the end of 2023.

Beginning in the third quarter of 2020, our Polyurethanes segment implemented a restructuring program to optimize its downstream footprint. During the second quarter of 2022, this optimization program was further expanded to include the entire Polyurethanes business. In connection with this restructuring program, we recorded net restructuring expense of approximately $5 million and $7 million in the six months ended June 30, 2023 and 2022, respectively, primarily related to workforce reductions. We expect to record further restructuring expenses of approximately $1 million through the end of 2023.

Beginning in the second quarter of 2020, our Advanced Materials segment implemented restructuring programs in connection with the CVC Thermoset Specialties Acquisition, the alignment of the segment’s commercial organization and optimization of the segment’s manufacturing processes. In connection with these restructuring programs, we recorded net restructuring expense of approximately $3 million in the six months ended June 30, 2023, primarily related to a site closure. There were no significant restructuring costs incurred during the six months ended June 30, 2022. We expect to record further restructuring expenses of approximately $1 million through the end of 2023.