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Intangible Assets (Details) - Licenses - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Licenses |  |
Balance, beginning of period | $ 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, end of period | $ 1,886 | $ 1,834

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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + 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 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition. + References No definition available. + Details
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- Definition Amount of assets received, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an exchange. + References No definition available. + Details
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- Definition Amount of assets disposed of, excluding financial assets and goodwill, lacking physical substance with an indefinite life, in an exchange. + References No definition available. + Details
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- Definition Changes not otherwise specified in the taxonomy to the account balance of a major indefinite-lived intangible asset class during the period. + References No definition available. + Details
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- Details
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