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Asset Retirement Obligation | 12 Months Ended
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Dec. 31, 2019
Asset Retirement Obligation [Abstract] |
Asset Retirement Obligation | Note 11 Asset Retirement Obligations U.S. Cellular is subject to asset retirement obligations associated with its leased cell sites, switching office sites, retail store sites and office locations. Asset retirement obligations generally include obligations to restore leased land, towers, retail store and office premises to their pre-lease conditions. These obligations are included in Other deferred liabilities and credits in the Consolidated Balance Sheet. In 2019 and 2018, U.S. Cellular performed a review of the assumptions and estimated costs related to its asset retirement obligations. The results of the reviews (identified as Revisions in estimated cash outflows) and other changes in asset retirement obligations during 2019 and 2018, were as follows:
| 2019 |  | 2018
(Dollars in millions) |  |  |
Balance at beginning of year | $ | 203 |  |  | $ | 183 |
Additional liabilities accrued | 2 |  |  | 2 |
Revisions in estimated cash outflows | 2 |  |  | 8 |
Disposition of assets | (1 | ) |  | (1 | )
Accretion expense | 14 |  |  | 12 |
Transferred to Liabilities held for sale | — |  |  | (1 | )
Balance at end of year | $ | 220 |  |  | $ | 203 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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