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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2024
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Changes in Asset Retirement Obligation

The following table documents the changes in the Company’s asset retirement obligation during the years ended December 31 (dollars in millions):

 

 

2024

 

 

2023

 

 

2022

 

Asset retirement obligation at beginning of year

 

$

18

 

 

$

16

 

 

$

17

 

Liabilities incurred

 

 

—

 

 

 

2

 

 

 

—

 

Liabilities settled

 

 

(1

)

 

 

—

 

 

 

(2

)

Accretion expense

 

 

1

 

 

 

—

 

 

 

1

 

Asset retirement obligation at end of year

 

$

18

 

 

$

18

 

 

$

16