Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2020

Schedule of components of accounts receivable

The following table presents details of our accounts receivable balances:


	As of December 31,
	2020		2019
	(Dollars in millions)
Trade and purchased receivables	$	1,717	1,971
Earned and unbilled receivables	345		374
Other	91		20
Total accounts receivable	2,153		2,365
Less: allowance for credit losses	(191)		(106)
Accounts receivable, less allowance	$	1,962	2,259

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)
2020(1)	$	106	189	(104)	191
2019	142		145	(181)	106
2018	164		153	(175)	142

_______________________________________________________________________________

(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". Please refer to Note 5 - Credit Losses on Financial instruments for more information.