Accumulated Other Comprehensive Loss (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Schedule of accumulated other comprehensive income (loss)

The table below summarizes changes in accumulated other comprehensive (loss) recorded on our consolidated balance sheet by component for the years ended December 31, 2019 and December 31, 2020:

	Pension Plans		Foreign Currency Translation Adjustments and Other	Total
	(Dollars in millions)
Balance at December 31, 2018	$	5	(176)	(171)
Other comprehensive loss before reclassifications	—		(5)	(5)
Amounts reclassified from accumulated other comprehensive loss	(3)		—	(3)
Net other comprehensive loss	(3)		(5)	(8)
Balance at December 31, 2019	$	2	(181)	(179)
Balance at December 31, 2019	$	2	(181)	(179)
Other comprehensive loss, net of tax	(15)		(40)	(55)
Net other comprehensive loss	(15)		(40)	(55)
Balance at December 31, 2020	$	(13)	(221)	(234)