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Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2021
Receivables [Abstract]  
Schedule of Accounts Receivable
Accounts receivable consist of the following:
December 31,
(Dollars in millions)20212020
Accounts receivable$157 $104 
Less allowance for doubtful accounts(1)(2)
Accounts receivable, net
$156 $102