Intangible Assets (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Licenses
Balance, beginning of period	$ 1,834	[1]
Transferred to Assets held for sale	(26)
Balance, end of period	1,808	[1]
Total winning bid	$ 338

[1] Amounts include 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 have not yet been granted by the FCC. See Note 8 — Variable Interest Entities for further information.