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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021 and 2020. All intangible assets are being amortized over their estimated useful lives, as indicated below, with no estimated residual values.
December 31, 2021December 31, 2020
(Dollars in millions)Gross
 Carrying
Amount		Accumulated AmortizationNet Carrying AmountGross
Carrying
 Amount		Accumulated AmortizationNet Carrying Amount
Customer relationships$957 $(908)$49 $957 $(899)$58 
Patents and licenses9 (6)3 7 (5)2 
Total intangible assets
$966 $(914)$52 $964 $(904)$60 
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:
(in millions)
Year Ending December 31,
Estimated Annual Amortization
2022$9 
20239 
20249 
20259 
20269