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Equipment Installment Plans - Gross Receivables by Credit Category (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | $ 1,013 | $ 1,007
2018 | 17 |
2019 | 224 |
2020 | 562 |
2021 | 210 |
Unbilled |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 957 | 948
Billed |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 42 | 43
Equipment installment plan receivables, past due | 14 | 16
Lowest Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 868 | 863
2018 | 15 |
2019 | 202 |
2020 | 484 |
2021 | 167 |
Lowest Risk | Unbilled |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 826 | 819
Lowest Risk | Billed |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 35 | 36
Equipment installment plan receivables, past due | 7 | 8
Lower Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 108 | 108
2018 | 1 |
2019 | 18 |
2020 | 61 |
2021 | 28 |
Lower Risk | Unbilled |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 99 | 98
Lower Risk | Billed |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 5 | 5
Equipment installment plan receivables, past due | 4 | 5
Slight Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 27 | 25
2018 | 1 |
2019 | 3 |
2020 | 12 |
2021 | 11 |
Slight Risk | Unbilled |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 24 | 22
Slight Risk | Billed |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 1 | 1
Equipment installment plan receivables, past due | 2 | 2
Higher Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 10 | 11
2018 | 0 |
2019 | 1 |
2020 | 5 |
2021 | 4 |
Higher Risk | Unbilled |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 8 | 9
Higher Risk | Billed |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 1 | 1
Equipment installment plan receivables, past due | $ 1 | $ 1

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