Accounts Receivable

12 Months Ended

Dec. 31, 2019

Receivables [Abstract]

Accounts Receivable

Accounts Receivable

The following table presents details of our accounts receivable balances:

	December 31,
	2019		2018
	(Dollars in millions)
Trade receivables	529		533
Earned and unbilled receivables	151		177
Other	—		13
Total accounts receivable	680		723
Less: allowance for doubtful accounts (1)	(13	)	(11	)
Accounts receivable, less allowance	667		712

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(1) CenturyLink's acquisition of us caused our assets and liabilities to be recognized at fair value and resulted in the allowance for doubtful accounts being reset as of the date of acquisition.

We are exposed to concentrations of credit risk from our customers and other telecommunications service providers. We generally do not require collateral to secure our receivable balances.

The following table presents details of our allowance for doubtful accounts:

	Beginning Balance	Additions	Deductions		Ending Balance
	(Dollars in millions)
2019	11	24	(22	)	13
2018	3	18	(10	)	11
December 31, 2017 (Successor)	—	3	—		3
October 31, 2017 (Predecessor)	29	16	(12	)	33