Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Goodwill

	December31,
GOODWILL (Dollars in millions)	2025		2024
Carrying amount at beginning of year	$	1,368	$	1,378
Translation differences		11		(10	)
Carrying amount at end of year	$	1,379	$	1,368

Schedule of Amortizable Intangibles

	December 31,
AMORTIZABLE INTANGIBLES (Dollars in millions)	2025			2024
Gross carrying amount	$	401		$	386
Accumulated amortization		(393	)		(379	)
Carrying value	$	7		$	7