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Accounts Receivable and Notes Receivable and Credit Quality of Receivables (Tables)
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Summary of components of current and long-term accounts and notes receivable, net
The following summarizes the components of current and long-term accounts and notes receivable, net:
 
As of December 31,
 
2019
 
2018
Current:
 
 
 
Accounts receivable
$
668

 
$
615

Notes receivable
123

 
138

Allowance for doubtful accounts
(36
)
 
(40
)
Current accounts and notes receivable, net
$
755

 
$
713

Long-term:
 
 
 
Notes receivable, net of allowance
53

 
40

Total accounts and notes receivable, net
$
808

 
$
753
Summary of the components of total notes receivable, net
The following summarizes the components of total notes receivable, net:
 
December 31, 2019
 
Balances over 90 days past due
 
December 31, 2018
 
Balances over 90 days past due
Notes receivable:
 
 
 
 
 
 
 
Domestic
$
79

 
$
12

 
$
55

 
$
6

International
97

 
18

 
123

 
25

     Total notes receivable
176

 
30

 
178

 
31

 
 
 
 
 
 
 
 
Notes receivable allowance
 
 
 
 
 
 
 
Domestic
(2
)
 
(2
)
 
(6
)
 
(6
)
International
(15
)
 
(15
)
 
(18
)
 
(18
)
Total notes receivable allowance
(17
)
 
(17
)
 
(24
)
 
(24
)
 
 
 
 
 
 
 
 
Notes receivable, net
$
159

 
$
13

 
$
154

 
$
7
Schedule of activity in allowance for notes receivable
The activity in our allowance for notes receivable for each of the years ended December 31, 2019 and 2018 is as follows:
 
December 31, 2019
 
December 31, 2018
Beginning allowance for notes receivable
$
(24
)
 
$
(21
)
Provision
(3
)
 
(6
)
Charge-offs and recoveries
10

 
3

Ending allowance for notes receivable
$
(17
)
 
$
(24
)