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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2024
Receivables [Abstract]  
Schedule of accounts receivable
The following table presents details of our accounts receivable balances:

Years Ended December 31,
20242023
(Dollars in millions)
Trade receivables$457 435 
Earned and unbilled receivables85 122 
Other2 1 
Total accounts receivable544 558 
Less: allowance for credit losses(12)(13)
Accounts receivable, less allowance$532 545