Relationship with Former Parent and Related Entities (Tables)

12 Months Ended

Dec. 31, 2020

Related Party Transactions [Abstract]

Summary of amount due to and from related parties

Amounts due to and due from related party components as summarized in the below table: 

(Dollars in millions)	As of December 31
RELATED PARTY	2020		2019
Related party receivable	$	9	$	11
Related party payables	$	2	$	3
Related party short term debt	$	16	$	1
Related party long-term debt	$	115	$	—