Accounts Receivable

12 Months Ended

Dec. 31, 2017

Receivables [Abstract]

Accounts Receivable

Accounts Receivable

The following table presents details of our accounts receivable balances:

	Successor			Predecessor
	December 31, 2017			December 31, 2016
	(Dollars in millions)
Trade and purchased receivables	$	562		588
Earned and unbilled receivables	165			140
Other	24			13
Total accounts receivable	751			741
Less: allowance for doubtful accounts (1)	(3		)	(29	)
Accounts receivable, less allowance	$	748		712

(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)
December 31, 2017 (Successor)	$	—	3	—		3
October 31, 2017 (Predecessor)	29		16	(12	)	33
2016 (Predecessor)	32		18	(21	)	29
2015 (Predecessor)	$	30	23	(21	)	32