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Goodwill
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
Note 14. Goodwill
There were no changes to the carrying amount of goodwill for the years ended December 31, 2024 and 2023:
December 31,
20242023
(Dollars in millions)
Goodwill$193 $193