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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
Fair value measurements
TDS has applied the provisions of fair value accounting for purposes of computing the fair value of financial instruments for disclosure purposes as displayed below.
 Level within the Fair Value HierarchySeptember 30, 2025December 31, 2024
 Book ValueFair ValueBook ValueFair Value
(Dollars in thousands)     
Long-term debt2$837,045 $771,402 $2,445,780 $2,420,367