Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2015

Receivables [Abstract]

Schedule of components of accounts receivable

The following table presents details of our accounts receivable balances:

	As of December 31,
	2015			2014
	(Dollars in millions)
Trade and purchased receivables	$	1,789		1,821
Earned and unbilled receivables	288			307
Other	18			22
Total accounts receivable	2,095			2,150
Less: allowance for doubtful accounts	(152		)	(162	)
Accounts receivable, less allowance	$	1,943		1,988

Schedule of details of allowance for doubtful accounts

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

	Beginning Balance		Additions	Deductions		Ending Balance
	(Dollars in millions)
2015	$	162	177	(187	)	152
2014	$	155	159	(152	)	162
2013	$	158	152	(155	)	155