Intangible Assets (Details) - Licenses $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Licenses
Balance, beginning of period	$ 1,844	[1]
Acquisitions	46
Transferred to Assets held for sale	(23)
Exchanges	(3)
Balance, end of period	1,864	[1]
Total winning bid	$ 338

[1] Amount includes payments totaling $338 million made by Advantage Spectrum 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.