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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2024
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 HierarchyMarch 31, 2024December 31, 2023
 Book ValueFair ValueBook ValueFair Value
(Dollars in millions)     
Long-term debt
Retail2$1,500 $1,109 $1,500 $1,097 
Institutional2536 435 536 451 
Other22,187 2,187 2,103 2,103