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Intangible Assets (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill |  |  |  |
Balance, beginning of period |  |  | $ 766 |
Balance, end of period |  |  | 766 | $ 766
Licenses |  |  |  |
Licenses and Franchise Rights |  |  |  |
Balance, beginning of period |  |  | 1,844 | 1,454
Acquisitions |  |  | 53 | 346
Transferred to Assets held for sale |  |  | (8) |
Divestitures |  |  | (1) |
Exchanges - Licenses received |  |  | 25 | 43
Exchanges - Licenses surrendered |  |  | (18) |
Other |  |  |  | 1
Balance, end of period | $ 1,454 |  | 1,895 | 1,844
Licenses | U.S. Cellular |  |  |  |
Licenses and Franchise Rights |  |  |  |
Balance, beginning of period |  |  | 1,838 | 1,448
Acquisitions |  |  | 53 | 346
Transferred to Assets held for sale |  |  | (8) |
Exchanges - Licenses received |  |  | 25 | 43
Exchanges - Licenses surrendered |  |  | (18) |
Other |  |  |  | 1
Balance, end of period | 1,448 |  | 1,890 | 1,838
Licenses | TDS Telecom Wireline |  |  |  |
Licenses and Franchise Rights |  |  |  |
Balance, beginning of period |  |  | 3 | 3
Divestitures |  |  | (1) |
Balance, end of period | 3 |  | 2 | 3
Licenses | TDS Telecom Cable |  |  |  |
Licenses and Franchise Rights |  |  |  |
Balance, beginning of period |  |  | 3 | 3
Balance, end of period | 3 |  | 3 | 3
Goodwill |  |  |  |
Goodwill |  |  |  |
Balance, beginning of period |  |  | 766 | 771
Divestitures |  |  |  | (5)
Balance, end of period | 771 |  | 766 | 766
Goodwill | U.S. Cellular |  |  |  |
Goodwill |  |  |  |
Balance, beginning of period |  |  | 227 | 227
Balance, end of period | 227 |  | 227 | 227
Accumulated impairment losses in prior periods | (334) |  |  |
Goodwill | TDS Telecom Wireline |  |  |  |
Goodwill |  |  |  |
Balance, beginning of period |  |  | 409 | 414
Divestitures |  |  |  | (5)
Balance, end of period | 414 |  | 409 | 409
Accumulated impairment losses in prior periods | (29) |  |  |
Goodwill | TDS Telecom Cable |  |  |  |
Goodwill |  |  |  |
Balance, beginning of period |  |  | 95 | 95
Balance, end of period | 95 |  | 95 | 95
Goodwill | TDS Telecom HMS |  |  |  |
Goodwill |  |  |  |
Balance, beginning of period |  |  | 35 | 35
Balance, end of period | 35 |  | $ 35 | $ 35
Accumulated impairment losses in prior periods | (84) |  |  |
Loss on impairment |  | $ (84) |  |
Goodwill | Corporate, Eliminations and Other |  |  |  |
Goodwill |  |  |  |
Accumulated impairment losses in prior periods | $ (4) |  |  |

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