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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets
The following disclosure presents certain information regarding the Company's intangible assets as of December 31, 2023 and 2022. All intangible assets are being amortized over their estimated useful lives, as indicated below, with no estimated residual values.
December 31, 2023December 31, 2022
(Dollars in millions)Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Acquired Intangible Assets$1,087 $(940)$147 $1,087 $(918)$169 
Patents and licenses10 (6)4 9 (6)3 
Total intangible assets
$1,097 $(946)$151 $1,096 $(924)$172 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense The estimated annual amortization expense related to intangible assets for the subsequent five years is as follows:
(Dollars in millions)
Year Ending December 31,
Estimated Annual Amortization
2024$22 
202522 
202622 
202718 
202814