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Equipment Installment Plans - Gross Receivables by Credit Category (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | $ 1,161 | $ 1,085
2019 | 1 |
2020 | 94 |
2021 | 428 |
2022 | 638 |
Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 1,095 | 1,019
Billed | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 45 | 47
Billed | Past Due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 21 | 19
Lowest Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 1,024 | 946
2019 | 1 |
2020 | 87 |
2021 | 380 |
2022 | 556 |
Lowest Risk | Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 974 | 896
Lowest Risk | Billed | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 39 | 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 | 104 | 105
2019 | 0 |
2020 | 6 |
2021 | 40 |
2022 | 58 |
Lower Risk | Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 93 | 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 | 27 | 27
2019 | 0 |
2020 | 1 |
2021 | 6 |
2022 | 20 |
Slight Risk | Unbilled | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 23 | 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 | 3 | 2
Higher Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 6 | 7
2019 | 0 |
2020 | 0 |
2021 | 2 |
2022 | 4 |
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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