Business and Summary of Significant Accounting Principles (Wireless Equipment Installment Plan (EIP) Receivables) (Details) |
12 Months Ended |
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Dec. 31, 2017
payment
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| Loans and Leases Receivable Disclosure [Line Items] | |
| Number of installment plan payments | 12 |
| Maximum | |
| Loans and Leases Receivable Disclosure [Line Items] | |
| Installment period to purchase wireless devices | 24 months |
| X | ||||||||||
- Definition Equipment Installment Plan Payment Term No definition available.
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| X | ||||||||||
- Definition Number of Installment Plan Payments required for right to trade-in handset. No definition available.
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Details
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