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Revenue from Contracts with Customers - Narrative (Details)
 6 Months Ended
Jun. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Management fee, percentage 8.00%
Service fee retained by Sprint 8.60%
Management fee on prepaid wireless revenues and costs 6.00%
Cable  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Installation revenue, recognition period 10 months
Commissions and other costs, recognition period (in months) 44 months
Wireline  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Installation revenue, recognition period 11 months
Commissions and other costs, recognition period (in months) 72 months
Minimum  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Reimbursement payment, cost of equipment and commissions, benefit period for recognition 21 months
Maximum  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Reimbursement payment, cost of equipment and commissions, benefit period for recognition 53 months