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Equipment Installment Plans - Gross Receivables by Credit Category (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | $ 948 | $ 1,008
2017 | 2 |
2018 | 153 |
2019 | 476 |
2020 | 317 |
Unbilled |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 890 | 942
Billed |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 42 | 45
Equipment installment plan receivables, past due | 16 | 21
Lowest Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 809 | 860
2017 | 2 |
2018 | 139 |
2019 | 408 |
2020 | 260 |
Lowest Risk | Unbilled |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 764 | 812
Lowest Risk | Billed |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 36 | 37
Equipment installment plan receivables, past due | 9 | 11
Lower Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 102 | 110
2017 | 0 |
2018 | 11 |
2019 | 51 |
2020 | 40 |
Lower Risk | Unbilled |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 94 | 99
Lower Risk | Billed |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 4 | 5
Equipment installment plan receivables, past due | 4 | 6
Slight Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 25 | 28
2017 | 0 |
2018 | 2 |
2019 | 12 |
2020 | 11 |
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 | 1 | 2
Equipment installment plan receivables, past due | 2 | 3
Higher Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 12 | 10
2017 | 0 |
2018 | 1 |
2019 | 5 |
2020 | 6 |
Higher Risk | Unbilled |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 10 | 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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