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Equipment Installment Plans | 3 Months Ended
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Mar. 31, 2018
Receivables [Abstract] |
Equipment Installment Plans | Note 4 Equipment Installment Plans U.S. Cellular 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. U.S. Cellular 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, U.S. Cellular begins amortizing the liability and records this amortization as additional equipment revenue. As of March 31, 2018 and December 31, 2017, the guarantee liability related to these plans was $13 million and $15 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 March 31, 2018 and December 31, 2017.
|  | March 31, 2018 |  | December 31, 2017
(Dollars in millions) |  |  |  |  |  |
Equipment installment plan receivables, gross |  | $ | 871 |  | $ | 873
Deferred interest |  |  | – |  |  | (80)
Equipment installment plan receivables, net of deferred interest |  |  | 871 |  |  | 793
Allowance for credit losses |  |  | (66) |  |  | (65)
Equipment installment plan receivables, net |  | $ | 805 |  | $ | 728
Net balance presented in the Consolidated Balance Sheet as: |  |  |  |  |  |
Accounts receivable — Customers and agents (Current portion) |  | $ | 496 |  | $ | 428
Other assets and deferred charges (Non-current portion) |  |  | 309 |  |  | 300
Equipment installment plan receivables, net |  | $ | 805 |  | $ | 728
U.S. Cellular uses various inputs, including internal data, information from the 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:
|  | March 31, 2018 |  | December 31, 2017
|  | Lower Risk |  | Higher Risk |  | Total |  | Lower Risk |  | Higher Risk |  | Total
(Dollars in millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unbilled |  | $ | 809 |  | $ | 19 |  | $ | 828 |  | $ | 807 |  | $ | 20 |  | $ | 827
Billed — current |  |  | 28 |  |  | 1 |  |  | 29 |  |  | 31 |  |  | 1 |  |  | 32
Billed — past due |  |  | 12 |  |  | 2 |  |  | 14 |  |  | 12 |  |  | 2 |  |  | 14
Equipment installment plan receivables, gross |  | $ | 849 |  | $ | 22 |  | $ | 871 |  | $ | 850 |  | $ | 23 |  | $ | 873
Activity for the three months ended March 31, 2018 and 2017, in the allowance for credit losses balance for the equipment installment plan receivables was as follows:
|  | March 31, 2018 |  | March 31, 2017
(Dollars in millions) |  |  |  |  |  |
Allowance for credit losses, beginning of period |  | $ | 65 |  | $ | 50
Bad debts expense |  |  | 14 |  |  | 15
Write-offs, net of recoveries |  |  | (13) |  |  | (12)
Allowance for credit losses, end of period |  | $ | 66 |  | $ | 53

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- Definition The entire disclosure for financing receivables. Examples of financing receivables include, but are not limited to, loans, trade accounts receivables, notes receivable, credit cards, and receivables relating to a lessor's right(s) to payment(s) from a lease other than an operating lease that is recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -URI http://asc.fasb.org/topic&trid=2196771 + Details
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- References No definition available. + Details
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