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Revenue Recognition, Performance Obligations (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2018
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing Of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Amount $ 578
Revenue, Practical Expedient [Abstract]  
Remaining performance obligation, practical expedient true
Remaining performance obligation, practical expedient description TDS has certain contracts at U.S. Cellular and TDS Telecom in which it bills an amount equal to a fixed per-unit price multiplied by a variable quantity (e.g., roaming agreements with other carriers). Because TDS invoices for such items in an amount that corresponds directly with the value of the performance completed to date, TDS may recognize revenue in that amount. As a practical expedient, these contracts are excluded from the estimate of future revenues expected to be recognized related to performance obligations that are unsatisfied as of the end of a reporting period.
Remainder of 2018  
Revenue, Remaining Performance Obligation, Expected Timing Of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Amount $ 285
2019  
Revenue, Remaining Performance Obligation, Expected Timing Of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Amount 200
Thereafter  
Revenue, Remaining Performance Obligation, Expected Timing Of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Amount $ 93