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Intangible Assets - Schedules (Details) - Licenses - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Licenses |  |
Balance at beginning of year | $ 2,186 | $ 2,223
Acquisitions | 267 | 8
Transferred to Assets held for sale | 0 | (51)
Divestitures | (10) | (11)
Exchanges - Licenses received | 26 | 18
Exchanges - Licenses surrendered | 0 | (1)
Capitalized interest | 2 | 0
Balance at end of year | $ 2,471 | $ 2,186

X
- Definition The increase (decrease) during the period in book value of long-lived assets that the reporting entity plans to sell within one year (or one business cycle). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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