Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2021

Schedule of the entity's accounts receivable balances

The following table presents details of our accounts receivable balances:


	As of December 31,
	2021		2020
	(Dollars in millions)
Trade and purchased receivables	$	268	325
Earned and unbilled receivables	35		63
Other	36		37
Total accounts receivable	339		425
Less: allowance for credit losses	(38)		(61)
Accounts receivable, less allowance	$	301	364

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)
2021	$	61	27	(50)	38
2020(1)	39		66	(44)	61
2019	41		51	(53)	39

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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.