Inventories (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2022

Dec. 31, 2021

Inventory Disclosure [Abstract]

Schedule of Inventory, Current

Inventories consists of the following:

(Dollars in millions)	March 31, 2022		December 31, 2021
Raw materials	$	48	$	43
Work in progress	182		161
Finished goods	1		1
Total	$	231	$	205

Inventories consists of the following:

	December 31,
(Dollars in millions)	2021		2020
Raw materials	$	43	$	52
Work in progress	161		193
Finished goods	1		2
Total	$	205	$	247