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Equipment Installment Plans - Gross Receivables by Credit Category (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | $ 951 | $ 1,008
2017 | 1 |
2018 | 93 |
2019 | 389 |
2020 | 468 |
Unbilled |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 894 | 942
Billed |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 40 | 45
Equipment installment plan receivables, past due | 17 | 21
Lowest Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 809 | 860
2017 | 1 |
2018 | 84 |
2019 | 337 |
2020 | 387 |
Lowest Risk | Unbilled |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 767 | 812
Lowest Risk | Billed |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables | 34 | 37
Equipment installment plan receivables, past due | 8 | 11
Lower Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 104 | 110
2017 | 0 |
2018 | 7 |
2019 | 39 |
2020 | 58 |
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 | 4 | 5
Equipment installment plan receivables, past due | 5 | 6
Slight Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Equipment installment plan receivables, gross | 25 | 28
2017 | 0 |
2018 | 2 |
2019 | 9 |
2020 | 14 |
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 | 13 | 10
2017 | 0 |
2018 | 0 |
2019 | 4 |
2020 | 9 |
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 | $ 2 | $ 1

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