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Equipment Installment Plans - Gross Receivables by Credit Category (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables, gross | $ 974 | $ 873
Unbilled |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 921 | 827
Billed |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 36 | 32
Equipment installment plan receivables, past due | 17 | 14
Lower Risk |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables, gross | 954 | 850
Lower Risk | Unbilled |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 904 | 807
Lower Risk | Billed |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 35 | 31
Equipment installment plan receivables, past due | 15 | 12
Higher Risk |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables, gross | 20 | 23
Higher Risk | Unbilled |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 17 | 20
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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