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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Licenses | Activity related to UScellular's Licenses is presented below.
| 2020 |  | 2019
(Dollars in millions) |  |  |
Balance at beginning of year | $ | 2,471 |  |  | $ | 2,186 |
Acquisitions | 171 |  |  | 267 |
Divestitures | (18) |  |  | (10) |
Exchanges - Licenses received | — |  |  | 26 |
Capitalized interest | 5 |  |  | 2 |
Balance at end of year | $ | 2,629 |  |  | $ | 2,471 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance and exist in perpetuity, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b),(d) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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