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Intangible Assets (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2016
Licenses |
Licenses |
Licenses |  |  |  |  |
| 2016 |  | 2015
(Dollars in millions) |  |  |  |  |
Balance at beginning of year | $ | 1,834 |  | $ | 1,443
| Acquisitions |  | 53 |  |  | 346
| Transferred to Assets held for sale |  | (8) |  |  | –
| Exchanges - Licenses received |  | 25 |  |  | 43
| Exchanges - Licenses surrendered |  | (18) |  |  | –
| Other |  | – |  |  | 2
Balance at end of year | $ | 1,886 |  | $ | 1,834

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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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