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The weighted average rates used to determine the benefit obligations were as follows for the year ended December 31, 2020, the Successor period July 2, 2019 through December 31, 2019, and the Predecessor period January 1, 2019 through July 1, 2019: 

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The weighted average rates used to determine net periodic pension expense (benefit) were as follows for the year ended December 31, 2020, the Successor period July 2, 2019 through December 31, 2019, the Predecessor period January 1, 2019 through July 1, 2019 and the year ended December 31, 2018: 

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A one-percentage-point change in the assumed health care cost trend rates would change the projected benefit obligation for international non-pension postretirement benefits by approximately $2 and service cost and interest cost by $1. The impact on U.S. plans is negligible. 

