Intangible Assets (Details) - Licenses - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2016
Licenses
Balance, beginning of period	[1]	$ 1,844
Acquisitions		46
Transferred to Assets held for sale		(16)
Exchange - Licenses received		12
Exchange - Licenses surrendered		(10)
Balance, end of period		1,876
Total winning bid		$ 338

[1] Amounts include payments totaling $338 million made by Advantage Spectrum L.P to the FCC for licenses in which it was the provisional winning bidder in Auction 97. These licenses were granted by the FCC in July 2016. See Note 9 — Variable Interest Entities for additional information.