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Long-term Financing and Sales of Receivables (Tables)
12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Long-Term Financing
Long-term receivables consist of receivables with payment terms greater than twelve months, long-term loans and lease receivables under sales-type leases. Long-term receivables consist of the following:
December 31
2018
 
2017
Long-term receivables, gross
$
33

 
$
37

Less allowance for losses
(2
)
 

Long-term receivables
$
31

 
$
37

Less current portion
(7
)
 
(18
)
Non-current long-term receivables
$
24

 
$
19

Proceeds Received from Non-Recourse Sales of Accounts Receivable And Long-Term Receivables
The following table summarizes the proceeds received from sales of accounts receivable and long-term receivables for the years ended December 31, 2018, 2017 and 2016
Years ended December 31
2018
 
2017
 
2016
Accounts receivable sales proceeds
$
77

 
$
193

 
$
51

Long-term receivables sales proceeds
270

 
284

 
289

Total proceeds from receivable sales
$
347

 
$
477

 
$
340

Financing Receivables Aging Analysis
An aging analysis of financing receivables at December 31, 2018 and December 31, 2017 is as follows: 
December 31, 2018
Total
Long-term
Receivable
 
Current Billed
Due
 
Past Due Under 90 Days
 
Past Due Over 90 Days
Municipal leases secured tax exempt
$
22

 
$
1

 
$

 
$

Commercial loans and leases secured
11

 

 

 
2

Long-term receivables, including current portion
$
33

 
$
1

 
$

 
$
2


December 31, 2017
Total
Long-term
Receivable
 
Current Billed
Due
 
Past Due Under 90 Days
 
Past Due Over 90 Days
Municipal leases secured tax exempt
$
21

 
$

 
$
1

 
$
2

Commercial loans and leases secured
16

 
1

 
3

 
1

Long-term receivables, including current portion
$
37

 
$
1

 
$
4

 
$
3