Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2022

Receivables [Abstract]

Schedule of the entity's accounts receivable balances

The following table presents details of our accounts receivable balances:

	As of December 31,
	2022		2021
	(Dollars in millions)
Trade and purchased receivables	$	282	268
Earned and unbilled receivables	23		35
Other	40		36
Total accounts receivable	345		339
Less: allowance for credit losses	(36)		(38)
Accounts receivable, less allowance	$	309	301

Schedule of the entity's allowance for doubtful accounts

The following table presents details of our allowance for credit losses:

	Beginning Balance		Additions	Deductions	Ending Balance
	(Dollars in millions)
2022	$	38	60	(62)	36
2021	61		27	(50)	38
2020(1)	39		66	(44)	61

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(1)On January 1, 2020, we adopted ASU 2016-13 "Measurement of Credit Losses on Financial Instruments" and recognized a cumulative adjustment to our accumulated deficit as of the date of adoption of $3 million, net of $1 million tax effect. This adjustment is included within "Deductions". Please refer to Note 5—Credit Losses on Financial Instruments for more information.