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Equipment Installment Plans | 9 Months Ended
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Sep. 30, 2019
Receivables [Abstract] |
Equipment Installment Plans | Note 4 Equipment Installment Plans TDS sells devices to customers under equipment installment plans over a specified time period. For certain equipment installment plans, after a specified period of time or amount of payments, the customer may have the right to upgrade to a new device and have the remaining unpaid equipment installment contract balance waived, subject to certain conditions, including trading in the original device in good working condition and signing a new equipment installment contract. TDS values this trade-in right as a guarantee liability. The guarantee liability is initially measured at fair value and is determined based on assumptions including the probability and timing of the customer upgrading to a new device and the fair value of the device being traded-in at the time of trade-in. When a customer exercises the trade-in option, both the outstanding receivable and guarantee liability balances related to the respective device are reduced to zero, and the value of the used device that is received in the transaction is recognized as inventory. If the customer does not exercise the trade-in option at the time of eligibility, TDS begins amortizing the liability and records this amortization as additional equipment revenue. As of September 30, 2019 and December 31, 2018, the guarantee liability related to these plans was $9 million and $11 million, respectively, and is reflected in Customer deposits and deferred revenues in the Consolidated Balance Sheet. The following table summarizes equipment installment plan receivables as of September 30, 2019 and December 31, 2018.
| September 30, 2019 |  | December 31, 2018
(Dollars in millions) |  |  |
Equipment installment plan receivables, gross | $ | 975 |  |  | $ | 974 |
Allowance for credit losses | (82 | ) |  | (77 | )
Equipment installment plan receivables, net | $ | 893 |  |  | $ | 897 |
Net balance presented in the Consolidated Balance Sheet as: |  |  |
Accounts receivable — Customers and agents (Current portion) | $ | 574 |  |  | $ | 560 |
Other assets and deferred charges (Non-current portion) | 319 |  |  | 337 |
Equipment installment plan receivables, net | $ | 893 |  |  | $ | 897 |
TDS uses various inputs, including internal data, information from credit bureaus and other sources, to evaluate the credit profiles of its customers. From this evaluation, a credit class is assigned to the customer that determines the number of eligible lines, the amount of credit available, and the down payment requirement, if any. Customers assigned to credit classes requiring no down payment represent a lower risk category, whereas those assigned to credit classes requiring a down payment represent a higher risk category. The balance and aging of the equipment installment plan receivables on a gross basis by credit category were as follows:
| September 30, 2019 |  | December 31, 2018
| Lower Risk |  | Higher Risk |  | Total |  | Lower Risk |  | Higher Risk |  | Total
(Dollars in millions) |  |  |  |  |  |  |  |  |  |  |
Unbilled | $ | 898 |  |  | $ | 9 |  |  | $ | 907 |  |  | $ | 904 |  |  | $ | 17 |  |  | $ | 921 |
Billed — current | 44 |  |  | 1 |  |  | 45 |  |  | 35 |  |  | 1 |  |  | 36 |
Billed — past due | 21 |  |  | 2 |  |  | 23 |  |  | 15 |  |  | 2 |  |  | 17 |
Equipment installment plan receivables, gross | $ | 963 |  |  | $ | 12 |  |  | $ | 975 |  |  | $ | 954 |  |  | $ | 20 |  |  | $ | 974 |
Activity for the nine months ended September 30, 2019 and 2018, in the allowance for credit losses for equipment installment plan receivables was as follows:
| September 30, 2019 |  | September 30, 2018
(Dollars in millions) |  |  |
Allowance for credit losses, beginning of period | $ | 77 |  |  | $ | 65 |
Bad debts expense | 60 |  |  | 49 |
Write-offs, net of recoveries | (55 | ) |  | (41 | )
Allowance for credit losses, end of period | $ | 82 |  |  | $ | 73 |

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- Definition The entire disclosure for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2196816 + Details
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