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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2023
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, 2023December 31, 2022
 Book ValueFair ValueBook ValueFair Value
(Dollars in millions)     
Long-term debt
Retail2$1,500 $1,018 $1,500 $899 
Institutional2536 430 536 395 
Other21,864 1,864 1,753 1,753