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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2024
Asset Retirement Obligation [Abstract] |
Asset Retirement Obligations | Note 12 Asset Retirement Obligations UScellular is subject to asset retirement obligations associated with certain cell sites, land, switching offices, retail stores and office locations. TDS Telecom owns poles, cable and wire and certain buildings and also leases office space and property used for housing central office switching equipment and fiber cable. These assets and leases often have removal or remediation requirements. Asset retirement obligations are included in Other deferred liabilities and credits in the Consolidated Balance Sheet. In 2024 and 2023, 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 2024 and 2023, were as follows:
| 2024 |  | 2023
(Dollars in millions) |  |  |
Balance at beginning of year | $ | 556 |  |  | $ | 524 |
Additional liabilities accrued | 25 |  |  | 10 |
Revisions in estimated cash outflows | 9 |  |  | (3) |
Disposition of assets | (11) |  |  | (4) |
Accretion expense | 29 |  |  | 29 |
Balance at end of year | $ | 608 |  |  | $ | 556 |

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/410-20/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 20 -Topic 410 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-2 + Details
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