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Equipment Installment Plans (Table) | 9 Months Ended
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Sep. 30, 2021
Receivables [Abstract] |
Equipment installment plan receivables | The following table summarizes equipment installment plan receivables.
| September 30, 2021 |  | December 31, 2020
(Dollars in millions) |  |  |
Equipment installment plan receivables, gross | $ | 1,022 |  |  | $ | 1,007 |
Allowance for credit losses | (70) |  |  | (78) |
Equipment installment plan receivables, net | $ | 952 |  |  | $ | 929 |
Net balance presented in the Consolidated Balance Sheet as: |  |  |
Accounts receivable — Customers and agents (Current portion) | $ | 607 |  |  | $ | 590 |
Other assets and deferred charges (Non-current portion) | 345 |  |  | 339 |
Equipment installment plan receivables, net | $ | 952 |  |  | $ | 929 |
Equipment installment plan receivables credit categories | The balance and aging of the equipment installment plan receivables on a gross basis by credit category were as follows:
| September 30, 2021 |  | December 31, 2020
| Lowest Risk |  | Lower Risk |  | Slight Risk |  | Higher Risk |  | Total |  | Lowest Risk |  | Lower Risk |  | Slight Risk |  | Higher Risk |  | Total
(Dollars in millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unbilled | $ | 840 |  |  | $ | 93 |  |  | $ | 23 |  |  | $ | 6 |  |  | $ | 962 |  |  | $ | 819 |  |  | $ | 98 |  |  | $ | 22 |  |  | $ | 9 |  |  | $ | 948 |
Billed — current | 36 |  |  | 5 |  |  | 1 |  |  | — |  |  | 42 |  |  | 36 |  |  | 5 |  |  | 1 |  |  | 1 |  |  | 43 |
Billed — past due | 10 |  |  | 5 |  |  | 2 |  |  | 1 |  |  | 18 |  |  | 8 |  |  | 5 |  |  | 2 |  |  | 1 |  |  | 16 |
Total | $ | 886 |  |  | $ | 103 |  |  | $ | 26 |  |  | $ | 7 |  |  | $ | 1,022 |  |  | $ | 863 |  |  | $ | 108 |  |  | $ | 25 |  |  | $ | 11 |  |  | $ | 1,007 |
The balance of the equipment installment plan receivables as of September 30, 2021 on a gross basis by year of origination were as follows:
| 2018 |  | 2019 |  | 2020 |  | 2021 |  | Total
(Dollars in millions) |  |  |  |  |  |  |  |  |
Lowest Risk | $ | 1 |  |  | $ | 84 |  |  | $ | 346 |  |  | $ | 455 |  |  | $ | 886 |
Lower Risk | — |  |  | 6 |  |  | 36 |  |  | 61 |  |  | 103 |
Slight Risk | — |  |  | 1 |  |  | 6 |  |  | 19 |  |  | 26 |
Higher Risk | — |  |  | — |  |  | 2 |  |  | 5 |  |  | 7 |
Total | $ | 1 |  |  | $ | 91 |  |  | $ | 390 |  |  | $ | 540 |  |  | $ | 1,022 |
Equipment installment plans allowance for credit losses | Activity for the nine months ended September 30, 2021 and 2020, in the allowance for credit losses for equipment installment plan receivables was as follows:
| September 30, 2021 |  | September 30, 2020
(Dollars in millions) |  |  |
Allowance for credit losses, beginning of period | $ | 78 |  |  | $ | 84 |
Bad debts expense | 21 |  |  | 34 |
Write-offs, net of recoveries | (29) |  |  | (43) |
Allowance for credit losses, end of period | $ | 70 |  |  | $ | 75 |

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- Definition Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953659-111524 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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