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Employee Benefits (Tables)
12 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Funded Status of Defined Benefit Plans
The following table presents the funded status of our defined benefit plans as of December 31, 2024 and 2023:

 Years Ended December 31,
 20242023
 (Dollars in millions)
Fair value of plan assets$37 40 
Benefit obligation35 39 
Funded status$