Accounts Receivable (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2022

Dec. 31, 2021

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable consist of the following:

(Dollars in millions)	March 31, 2022		December 31, 2021
Accounts receivable	$	131	$	157
Less allowance for credit losses	(1)		(1)
Accounts receivable, net	$	130	$	156

Accounts receivable consist of the following:

	December 31,
(Dollars in millions)	2021		2020
Accounts receivable	$	157	$	104
Less allowance for doubtful accounts	(1)		(2)
Accounts receivable, net	$	156	$	102