v3.26.3
Intangible Assets
 9 Months Ended
Sep. 30, 2026
Intangible Asset, Goodwill and Other [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consist of the following:
September 30, 2026December 31, 2025
(Dollars in millions)Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Acquired intangible assets$1,087 $(1,000)$87 $1,087 $(984)$103 
Patents and licenses18 (11)7 18 (9)9 
Total intangible assets
$1,105 $(1,011)$94 $1,105 $(993)$112 
Amortization expense related to acquired intangible assets was $5 million for the three months ended September 30, 2026 and 2025, and $16 million for the nine months ended September 30, 2026 and 2025.