Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

All intangible assets are being amortized over their estimated useful lives, as indicated below, with no estimated residual values. Intangible assets consists of the following:


	December 31, 2025						December 31, 2024
(Dollars in millions)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Acquired intangible assets	$	1,087	$	(984)	$	103	$	1,087	$	(962)	$	125
Patents and licenses	18		(9)		9		14		(7)		7
Total intangible assets	$	1,105	$	(993)	$	112	$	1,101	$	(969)	$	132

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
2026	$	24
2027	20
2028	15
2029	14
2030	14