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Equipment Installment Plans - Gross Receivables by Credit Category (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | $ 1,074 | $ 1,085
2019 | 3 |
2020 | 157 |
2021 | 525 |
2022 | 389 |
Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 1,010 | 1,019
Billed | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 44 | 47
Billed | Past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 20 | 19
Lowest Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 941 | 946
2019 | 3 |
2020 | 146 |
2021 | 462 |
2022 | 330 |
Lowest Risk | Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 892 | 896
Lowest Risk | Billed | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 38 | 40
Lowest Risk | Billed | Past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 11 | 10
Lower Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 102 | 105
2019 | 0 |
2020 | 10 |
2021 | 52 |
2022 | 40 |
Lower Risk | Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 91 | 94
Lower Risk | Billed | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 5 | 5
Lower Risk | Billed | Past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 6 | 6
Slight Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 25 | 27
2019 | 0 |
2020 | 1 |
2021 | 8 |
2022 | 16 |
Slight Risk | Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 22 | 24
Slight Risk | Billed | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 1 | 1
Slight Risk | Billed | Past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 2 | 2
Higher Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 6 | 7
2019 | 0 |
2020 | 0 |
2021 | 3 |
2022 | 3 |
Higher Risk | Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 5 | 5
Higher Risk | Billed | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 0 | 1
Higher Risk | Billed | Past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | $ 1 | $ 1

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