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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2024
Receivables [Abstract]  
Schedule of components of accounts receivable
The following table presents details of our accounts receivable balances:
 As of December 31,
 20242023
 (Dollars in millions)
Trade and purchased receivables$1,181 1,181 
Earned and unbilled receivables63 165 
Other46 39 
Total accounts receivable1,290 1,385 
Less: allowance for credit losses(59)(67)
Accounts receivable, less allowance$1,231 1,318