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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Licenses | Activity related to U.S. Cellular's Licenses is presented below.
| 2018 |  | 2017
(Dollars in millions) |  |  |
Balance at beginning of year | $ | 2,223 |  |  | $ | 1,886 |
Acquisitions | 8 |  |  | 331 |
Transferred to Assets held for sale 1 | (51 | ) |  | (10 | )
Divestitures | (11 | ) |  | — |
Exchanges - Licenses received | 18 |  |  | 25 |
Exchanges - Licenses surrendered | (1 | ) |  | (9 | )
Balance at end of year | $ | 2,186 |  |  | $ | 2,223 |
1 | Licenses classified as Assets held for sale in 2018 are included in transactions which closed in the first quarter of 2019.

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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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