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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2020
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, 2020December 31, 2019
 Book ValueFair ValueBook ValueFair Value
(Dollars in millions)     
Cash and cash equivalents1$1,076 $1,076 $465 $465 
Long-term debt
Retail22,253 2,334 1,753 1,796 
Institutional2535 709 534 594 
Other2259 259 84 84