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Acquisitions, Divestitures and Exchanges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Mar. 31, 2016 | Feb. 29, 2016
Acquisitions |  |  |  |  |  |  |
Cash paid for acquisitions and licenses |  |  |  | $ 46 | $ 287 |  |
Federal Communications Commission deposit |  | $ 143 |  | 143 |  |  |
Exchanges |  |  |  |  |  |  |
Assets held for sale | $ 16 |  |  | 16 |  |  |
Cash received from divestitures and exchanges |  |  |  | 20 | 325 |  |
Gain on license sales and exchanges | 7 |  | $ 24 | 16 | 147 |  |
U.S. Cellular |  |  |  |  |  |  |
Exchanges |  |  |  |  |  |  |
Gain on license sales and exchanges | 7 |  | $ 24 | 16 | $ 147 |  |
U.S. Cellular | License exchange 1 |  |  |  |  |  |  |
Exchanges |  |  |  |  |  |  |
Assets held for sale | 8 |  |  | 8 |  |  |
Net cash to be received (paid) |  |  |  |  |  |  | $ 28
U.S. Cellular | License exchange 1, first closing |  |  |  |  |  |  |
Exchanges |  |  |  |  |  |  |
Cash received from divestitures and exchanges |  | 13 |  |  |  |  |
Gain on license sales and exchanges |  | 9 |  |  |  |  |
U.S. Cellular | License exchange 2 |  |  |  |  |  |  |
Exchanges |  |  |  |  |  |  |
Cash received from divestitures and exchanges | 2 |  |  |  |  |  |
Carrying value of licenses disposed of in exchange | 7 |  |  |  |  |  |
Gain on license sales and exchanges | 7 |  |  |  |  |  |
U.S. Cellular | License exchange 3 |  |  |  |  |  |  |
Exchanges |  |  |  |  |  |  |
Assets held for sale | 8 |  |  | 8 |  |  |
Net cash to be received (paid) |  |  |  |  |  | $ (1) |
U.S. Cellular | License Acquisitions | Aggregate license acquisitions |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |
License acquisition agreement amount | $ 56 |  |  | $ 56 |  |  |
Cash paid for acquisitions and licenses |  | $ 46 |  |  |  |  |

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