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Fair Value Measurements (Table)
 12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Fair value measurements
UScellular 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 HierarchyDecember 31, 2023December 31, 2022
 Book ValueFair ValueBook ValueFair Value
(Dollars in millions)     
Long-term debt
Retail
2$1,500 $1,097 $1,500 $899 
Institutional
2536 451 536 395 
Other
21,063 1,063 1,208 1,208