Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2021

Schedule of components of accounts receivable

The following table presents details of our accounts receivable balances:


	As of December 31,
	2021		2020
	(Dollars in millions)
Trade and purchased receivables	$	1,281	1,717
Earned and unbilled receivables	315		345
Other	62		91
Total accounts receivable	1,658		2,153
Less: allowance for credit losses	(114)		(191)
Accounts receivable, less allowance	$	1,544	1,962

Schedule of details of allowance for doubtful accounts

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


	Beginning Balance		Additions	Deductions	Ending Balance
	(Dollars in millions)
2021	$	191	105	(182)	114
2020(1)	106		189	(104)	191
2019	142		145	(181)	106

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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 $9 million, net of $2 million tax effect. This adjustment is included within "Deductions." See Note 6—Credit Losses on Financial Instruments for more information.