XML 45 R17.htm IDEA: XBRL DOCUMENT v3.24.3
Asset Retirement Obligations
9 Months Ended
Sep. 30, 2024
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
Note 10 Asset Retirement Obligations
Asset retirement obligations are included in Other deferred liabilities and credits in the Consolidated Balance Sheet.
During the three months ended September 30, 2024, UScellular and TDS Telecom performed a review of the assumptions and estimated future costs related to asset retirement obligations. The results of the reviews and other changes in asset retirement obligations during the nine months ended September 30, 2024 were as follows:
Asset Retirement Obligations
(Dollars in millions)
Balance at December 31, 2023$556 
Additional liabilities accrued24 
Revisions in estimated cash outflows
Disposition of assets(7)
Accretion expense22 
Balance at September 30, 2024$604