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Equipment Installment Plans - Gross Receivables by Credit Category (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | $ 1,085 | $ 1,007
2019 | 45 |
2020 | 309 |
2021 | 731 |
Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 1,019 | 948
Billed | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 47 | 43
Billed | Past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 19 | 16
Lowest Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 946 | 863
2019 | 41 |
2020 | 278 |
2021 | 627 |
Lowest Risk | Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 896 | 819
Lowest Risk | Billed | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 40 | 36
Lowest Risk | Billed | Past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 10 | 8
Lower Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 105 | 108
2019 | 3 |
2020 | 26 |
2021 | 76 |
Lower Risk | Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 94 | 98
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 | 5
Slight Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 27 | 25
2019 | 1 |
2020 | 4 |
2021 | 22 |
Slight Risk | Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 24 | 22
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 | 7 | 11
2019 | 0 |
2020 | 1 |
2021 | 6 |
Higher Risk | Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 5 | 9
Higher Risk | Billed | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 1 | 1
Higher Risk | Billed | Past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | $ 1 | $ 1

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