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Intangible Assets

9 Months Ended

Sep. 30, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible assets consists of the following:


	September 30, 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	$	(978)	$	109	$	1,087	$	(962)	$	125
Patents and licenses	14		(9)		5		14		(7)		7
Total intangible assets	$	1,101	$	(987)	$	114	$	1,101	$	(969)	$	132

Amortization expense related to acquired intangible assets was $5 million and $16 million for the three and nine months ended September 30, 2025, respectively, and $6 million and $17 million for the three and nine months ended September 30, 2024, respectively.