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Spectrum License Transactions
6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Spectrum License Transactions
Note 7 – Spectrum License Transactions

The following table summarizes our spectrum license activity for the six months ended June 30, 2018:
(in millions)
Spectrum Licenses
Balance at December 31, 2017
$
35,366

Spectrum license acquisitions
136

Costs to clear spectrum
30

Balance at June 30, 2018
$
35,532



We had the following spectrum license transactions in the six months ended June 30, 2018:

We recorded spectrum licenses received as part of our acquisition of the remaining equity interest in IWS at their estimated fair value of approximately $87 million. See Note 3 - Business Combinations for further information.

We closed on multiple spectrum purchase agreements in which we acquired total spectrum licenses of approximately $49 million for cash consideration. No gains or losses were recognized on the spectrum license purchases.