Goodwill

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

Goodwill

Changes in the carrying amount of goodwill by reportable segment are as follows:

(Dollars in millions)	AST		NC&C		IMS		Total
Balance at January 1, 2020 (1)	$	363	$	275	$	419	$	1,057
Acquisitions	—		—		—		—
Balance at December 31, 2020	363		275		419		1,057
Acquisitions	14		—		—		14
Balance at December 31, 2021	$	377	$	275	$	419	$	1,071

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(1)Goodwill is reported net of $1,313 million, $1,049 million and $606 million of accumulated impairments as of January 2020 for the AST, NC&C and IMS segments, respectively.