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Asset Retirement Obligations (Table)
 12 Months Ended
Dec. 31, 2024
Asset Retirement Obligation [Abstract]  
Asset retirement obligations
In 2024 and 2023, UScellular performed a review of the assumptions and estimated future costs related to asset retirement obligations. The results of the review and other changes in asset retirement obligations during 2024 and 2023, were as follows:
 20242023
(Dollars in millions)  
Balance at beginning of year$367 $346 
Additional liabilities accrued5 8 
Revisions in estimated cash outflows9 (3)
Disposition of assets(3)(3)
Accretion expense19 19 
Balance at end of year$397 $367