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Equipment Installment Plans - Gross Receivables by Credit Category (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | $ 964 | $ 1,008
2017 | 16 |
2018 | 223 |
2019 | 569 |
2020 | 156 |
Unbilled |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 900 | 942
Billed |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 43 | 45
Equipment installment plan receivables, past due | 21 | 21
Lowest Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 820 | 860
2017 | 15 |
2018 | 200 |
2019 | 480 |
2020 | 125 |
Lowest Risk | Unbilled |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 774 | 812
Lowest Risk | Billed |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 35 | 37
Equipment installment plan receivables, past due | 11 | 11
Lower Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 106 | 110
2017 | 1 |
2018 | 19 |
2019 | 67 |
2020 | 19 |
Lower Risk | Unbilled |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 95 | 99
Lower Risk | Billed |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 5 | 5
Equipment installment plan receivables, past due | 6 | 6
Slight Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 27 | 28
2017 | 0 |
2018 | 3 |
2019 | 16 |
2020 | 8 |
Slight Risk | Unbilled |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 22 | 23
Slight Risk | Billed |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 2 | 2
Equipment installment plan receivables, past due | 3 | 3
Higher Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 11 | 10
2017 | 0 |
2018 | 1 |
2019 | 6 |
2020 | 4 |
Higher Risk | Unbilled |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 9 | 8
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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