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Variable Interest Entities, Narrative (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Variable Interest Entities, Other Disclosures      
Assets $ 9,498 [1] $ 9,378 $ 9,295 [1]
Capital contributions, loans or advances 51 676  
Investment in unconsolidated entities, maximum exposure $ 5   $ 4
King Street Wireless out-of-period adjustment      
Variable Interest Entities, Other Disclosures      
Out-of-period adjustment description During the six months ended June 30, 2018, TDS recorded an out-of-period adjustment attributable to 2016 and 2017 due to errors in the application of accounting guidance applicable to the calculation of Noncontrolling interests with redemption features related to King Street Wireless, Inc.  This out-of-period adjustment had the impact of increasing Net income attributable to noncontrolling interests, net of tax, by $6 million and decreasing Net income attributable to TDS shareholders by $6 million for the six months ended June 30, 2018. TDS determined that this adjustment was not material to any of the periods impacted. The adjustment was made in the first quarter of 2018.    
Net income attributable to noncontrolling interests, net of tax | King Street Wireless out-of-period adjustment      
Variable Interest Entities, Other Disclosures      
Out-of-period adjustment $ 6    
Net income attributable to TDS shareholders | King Street Wireless out-of-period adjustment      
Variable Interest Entities, Other Disclosures      
Out-of-period adjustment (6)    
USCC EIP LLC      
Variable Interest Entities, Other Disclosures      
Capital contributions, loans or advances 33 $ 659  
Aquinas L.P.      
Variable Interest Entities, Other Disclosures      
Assets $ 0    
[1] The consolidated total assets as of June 30, 2018 and December 31, 2017, include assets held by consolidated variable interest entities (VIEs) of $793 million and $765 million, respectively, which are not available to be used to settle the obligations of TDS. The consolidated total liabilities as of June 30, 2018 and December 31, 2017, include certain liabilities of consolidated VIEs of $17 million and $21 million, respectively, for which the creditors of the VIEs have no recourse to the general credit of TDS. See Note 10 — Variable Interest Entities for additional information.