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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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Amount of gain (loss) on sale or disposal of intangible assets.

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