Equipment Installment Plans (Table)

12 Months Ended

Dec. 31, 2016

Receivables [Abstract]

Equipment installment plan receivables

The following table summarizes equipment installment plan receivables as of December 31, 2016 and 2015.

December 31,	2016		2015
(Dollars in millions)
Equipment installment plan receivables, gross	$	628	$	381
Deferred interest		(53)		(23)
Equipment installment plan receivables, net of deferred interest		575		358
Allowance for credit losses		(50)		(26)
Equipment installment plan receivables, net	$	525	$	332
Net balance presented in the Consolidated Balance Sheet as:
Accounts receivable — Due from customers and agents (Current portion)	$	345	$	264
Other assets and deferred charges (Non-current portion)		180		68
Equipment installment plan receivables, net	$	525	$	332

Equipment installment plan receivables credit categories

  The balance and aging of the equipment installment plan receivables on a gross basis by credit category were as follows:

	December 31, 2016						December 31, 2015
	Lower Risk		Higher Risk		Total		Lower Risk		Higher Risk		Total
(Dollars in millions)
Unbilled	$	553	$	38	$	591	$	343	$	11	$	354
Billed — current		23		2		25		17		1		18
Billed — past due		10		2		12		8		1		9
Equipment installment plan receivables, gross	$	586	$	42	$	628	$	368	$	13	$	381

Equipment installment plans allowance for credit losses

The activity in the allowance for credit losses balance for the equipment installment plan receivables was as follows:

	2016		2015
(Dollars in millions)
Allowance for credit losses, beginning of year	$	26	$	10
Bad debts expense		63		49
Write-offs, net of recoveries		(39)		(33)
Allowance for credit losses, end of year	$	50	$	26