Intangible Assets (Tables)

9 Months Ended

Sep. 30, 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 September 30, 2021 and December 31, 2020. All intangible assets are being amortized over their estimated useful lives, as indicated below, with no estimated residual values.

	September 30, 2021						December 31, 2020
(Dollars in millions)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer relationships	$	957	$	(905)	$	52	$	957	$	(899)	$	58
Patents and licenses	8		(6)		2		7		(5)		2
Total intangible assets	$	965	$	(911)	$	54	$	964	$	(904)	$	60