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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Schedule of components of accounts receivable

The following table presents details of our accounts receivable balances:
 
As of December 31,
 
2019
 
2018
 
(Dollars in millions)
Trade and purchased receivables
$
1,971

 
2,094

Earned and unbilled receivables
374

 
425

Other
20

 
21

Total accounts receivable
2,365

 
2,540

Less: allowance for doubtful accounts
(106
)
 
(142
)
Accounts receivable, less allowance
$
2,259

 
2,398
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)
2019
$
142

 
145

 
(181
)
 
106

2018
164

 
153

 
(175
)
 
142

2017
178

 
176

 
(190
)
 
164