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Long-term Financing and Sales of Receivables
12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Long-term Financing and Sales of Receivables
Long-term Financing and Sales of Receivables
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


The current portion of long-term receivables is included in Accounts receivable, net and the non-current portion of long-term receivables is included in Other assets in the Company’s Consolidated Balance Sheet. The Company recognized Interest income on long-term receivables of $1 million, $1 million, and $2 million for the years ended December 31, 2018, 2017 and 2016, respectively.
Certain purchasers of the Company's products and services may request that the Company provide long-term financing (defined as financing with a term greater than one year) in connection with the sale of products and services. These requests may include all or a portion of the purchase price of the products and services. The Company's obligation to provide long-term financing may be conditioned on the issuance of a letter of credit in favor of the Company by a reputable bank to support the purchaser's credit or a pre-existing commitment from a reputable bank to purchase the long-term receivables from the Company. The Company had outstanding commitments to provide long-term financing to third-parties totaling $62 million at December 31, 2018, compared to $93 million at December 31, 2017.
Sales of Receivables
From time to time, the Company sells accounts receivable and long-term receivables to third-parties under one-time arrangements. The Company may or may not retain the obligation to service the sold 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


At December 31, 2018, the Company had retained servicing obligations for $970 million of long-term receivables, compared to $873 million of long-term receivables at December 31, 2017. Servicing obligations are limited to collection activities of sold accounts receivables and long-term receivables.
Credit Quality of Long-Term Receivables and Allowance for Credit Losses
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


The Company uses an internally developed credit risk rating system for establishing customer credit limits. This system is aligned with and comparable to the rating systems utilized by independent rating agencies.
The Company’s policy for valuing the allowance for credit losses is to review all customer financing receivables for collectability on an individual receivable basis. For those receivables where collection risk is probable, the Company calculates the value of impairment based on the net present value of expected future cash flows from the customer.