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Equipment Installment Plans - Gross Receivables by Credit Category (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables, gross | $ 961 | $ 974
Unbilled |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 897 | 921
Billed |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 44 | 36
Equipment installment plan receivables, past due | 20 | 17
Lower Risk |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables, gross | 949 | 954
Lower Risk | Unbilled |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 888 | 904
Lower Risk | Billed |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 43 | 35
Equipment installment plan receivables, past due | 18 | 15
Higher Risk |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables, gross | 12 | 20
Higher Risk | Unbilled |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 9 | 17
Higher Risk | Billed |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 1 | 1
Equipment installment plan receivables, past due | $ 2 | $ 2

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