Receivables (Tables)

12 Months Ended

Dec. 31, 2021

Receivables [Abstract]

Schedule of Accounts Receivable

	As of December 31
(Dollars in millions)	2021		2020
Receivables	$	269	$	295
Allowance at beginning of year	$	(3)	$	(3)
Current period provision for expected credit losses	—		(1)
Reversal of allowance	1		—
Write-off against allowance	—		1
Allowance at end of year	$	(2)	$	(3)
Total receivables, net of allowance	$	267	$	292