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Relationship with Former Parent and Related Entities (Tables)
 6 Months Ended
Jun. 30, 2021
Related Party Transactions [Abstract]  
Summary of amount due to and from related parties Amounts due to and due from related parties are summarized in the below table:
Related PartyAs of
(Dollars in millions) June 30, 2021December 31, 2020
Related party receivable$8 $9 
Related party payables1 2 
Related party short-term debt— 16 
Related party long-term debt— 115