XML 57 R39.htm IDEA: XBRL DOCUMENT v3.19.1
Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Schedule of components of accounts receivable
The following table presents details of our accounts receivable balances:
 
As of December 31,
 
2018
 
2017
 
(Dollars in millions)
Trade and purchased receivables
$
2,094

 
2,245

Earned and unbilled receivables
425

 
436

Other
21

 
40

Total accounts receivable
2,540

 
2,721

Less: allowance for doubtful accounts
(142
)
 
(164
)
Accounts receivable, less allowance
$
2,398

 
2,557
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)
2018
$
164

 
153

 
(175
)
 
142

2017
178

 
176

 
(190
)
 
164

2016
152

 
192

 
(166
)
 
178