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Wireless Device Payment Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Receivables [Abstract]  
Device Payment Plan Receivables, Net
The following table displays device payment plan agreement receivables, net, that continue to be recognized in our condensed consolidated balance sheets:
 
At June 30,

 
At December 31,

(dollars in millions)
2018

 
2017

Device payment plan agreement receivables, gross
$
17,585

 
$
17,770

Unamortized imputed interest
(594
)
 
(821
)
Device payment plan agreement receivables, net of unamortized imputed interest
16,991

 
16,949

Allowance for credit losses
(754
)
 
(848
)
Device payment plan agreement receivables, net
$
16,237

 
$
16,101

 
 
 
 
Classified in our condensed consolidated balance sheets:
 
 
 
Accounts receivable, net
$
11,355

 
$
11,064

Other assets
4,882

 
5,037

Device payment plan agreement receivables, net
$
16,237

 
$
16,101
Balance and Aging of Device Payment Plan Agreement Receivables on Gross Basis
The balance and aging of the device payment plan agreement receivables on a gross basis were as follows: 
 
At June 30,

 
At December 31,

(dollars in millions)
2018

 
2017

Unbilled
$
16,393

 
$
16,591

Billed:
 
 
 
Current
973

 
975

Past due
219

 
204

Device payment plan agreement receivables, gross
$
17,585

 
$
17,770
Activity in Allowance for Credit Losses for Device Payment Plan Agreement Receivables
Activity in the allowance for credit losses for the device payment plan agreement receivables was as follows:
(dollars in millions)
2018

 
2017

Balance at January 1,
$
848

 
$
688

Bad debt expense
237

 
315

Write-offs
(331
)
 
(288
)
Balance at June 30,
$
754

 
$
715