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Asset Retirement Obligations (Table) | 12 Months Ended
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Dec. 31, 2021
Asset Retirement Obligation [Abstract] |
Asset retirement obligations | In 2021 and 2020, 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 2021 and 2020, were as follows:
| 2021 |  | 2020
(Dollars in millions) |  |  |
Balance at beginning of year | $ | 249 |  |  | $ | 220 |
Additional liabilities accrued | 9 |  |  | 5 |
Revisions in estimated cash outflows | 42 |  |  | 11 |
Disposition of assets | (1) |  |  | (1) |
Accretion expense | 16 |  |  | 14 |
Balance at end of year | $ | 315 |  |  | $ | 249 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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