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Acquisitions, Divestitures and Exchanges (Details) $ in Millions	1 Months Ended		3 Months Ended
	May 31, 2017 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Apr. 30, 2017 USD ($)	Feb. 29, 2016 USD ($)
Acquisitions
Cash paid for acquisitions and licenses			$ 14
Exchanges
Cash received from divestitures and exchanges			16		$ 2
Gain on license sales and exchanges			17
U.S. Cellular
Exchanges
Gain on license sales and exchanges			17
U.S. Cellular | License exchange 1
Exchanges
Net cash to be received							$ 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 1, second closing
Exchanges
Cash received from divestitures and exchanges			15
Gain on license sales and exchanges			$ 17
U.S. Cellular | Auction 1002
Acquisitions
Federal Communications Commission deposit		$ 143
U.S. Cellular | Auction 1002 | Subsequent event
Acquisitions
Fcc License Auction Total Licenses Won						188
Fcc License Auction Total Winning Bid						$ 329
U.S. Cellular | Auction 1002 | Future period
Acquisitions
Cash paid for acquisitions and licenses	$ 186

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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