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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2022
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 HierarchyJune 30, 2022December 31, 2021
 Book ValueFair ValueBook ValueFair Value
(Dollars in millions)     
Long-term debt
Retail2$1,500 $1,156 $1,500 $1,594 
Institutional2536 425 535 659 
Other21,486 1,486 944 944