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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
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, 2021December 31, 2020
 Book ValueFair ValueBook ValueFair Value
(Dollars in millions)     
Long-term debt
Retail2$1,500 $1,604 $2,753 $2,809 
Institutional2535 679 535 707 
Other2820 820 230 230