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Equipment Installment Plans - Gross Receivables by Credit Category (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | $ 1,211 | $ 1,085
2020 | 46 |
2021 | 336 |
2022 | 829 |
Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 1,141 | 1,019
Billed | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 48 | 47
Billed | Past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 22 | 19
Lowest Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 1,070 | 946
2020 | 43 |
2021 | 303 |
2022 | 724 |
Lowest Risk | Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 1,016 | 896
Lowest Risk | Billed | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 41 | 40
Lowest Risk | Billed | Past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 13 | 10
Lower Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 109 | 105
2020 | 3 |
2021 | 28 |
2022 | 78 |
Lower Risk | Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 98 | 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 | 26 | 27
2020 | 0 |
2021 | 4 |
2022 | 22 |
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 | 2 | 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
2020 | 0 |
2021 | 1 |
2022 | 5 |
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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