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Acquisitions, Divestitures and Exchanges (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Feb. 29, 2016 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Acquisitions |  |  |  |  |  |  |  |  |
Cash paid for licenses |  |  |  |  |  |  |  | $ 189 | $ 46
Federal Communications Commission deposit |  |  |  |  |  |  |  | 0 | 143
Exchanges |  |  |  |  |  |  |  |  |
Cash received from divestitures and exchanges |  |  |  |  |  |  |  | 19 | 20
Gain on license sales and exchanges |  |  |  |  |  | $ 7 |  | $ 19 | $ 16
License exchange 1 |  |  |  |  |  |  |  |  |
Exchanges |  |  |  |  |  |  |  |  |
Net cash to be received |  |  | $ 28 |  |  |  |  |  |
License exchange 1, first closing |  |  |  |  |  |  |  |  |
Exchanges |  |  |  |  |  |  |  |  |
Cash received from divestitures and exchanges |  |  |  |  |  |  | $ 13 |  |
Gain on license sales and exchanges |  |  |  |  |  |  | $ 9 |  |
License exchange 1, second closing |  |  |  |  |  |  |  |  |
Exchanges |  |  |  |  |  |  |  |  |
Cash received from divestitures and exchanges |  |  |  |  | $ 15 |  |  |  |
Gain on license sales and exchanges |  |  |  |  | $ 17 |  |  |  |
Auction 1002 |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Cash paid for licenses |  |  |  | $ 186 |  |  |  |  |
Federal Communications Commission deposit |  | $ 143 |  |  |  |  |  |  |
Fcc License Auction Total Licenses Won | 188 |  |  |  |  |  |  |  |
Fcc License Auction Total Winning Bid | $ 329 |  |  |  |  |  |  |  |

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