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Asset Retirement Obligations (Table) | 12 Months Ended
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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:
| 2024 |  | 2023
(Dollars in millions) |  |  |
Balance at beginning of year | $ | 367 |  |  | $ | 346 |
Additional liabilities accrued | 5 |  |  | 8 |
Revisions in estimated cash outflows | 9 |  |  | (3) |
Disposition of assets | (3) |  |  | (3) |
Accretion expense | 19 |  |  | 19 |
Balance at end of year | $ | 397 |  |  | $ | 367 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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