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Description of Operations (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jul. 10, 2013
Jul. 09, 2013
Oct. 22, 2012
Clearwire Acquisition [Member]      
Nature of Operations [Line Items]      
Payments to Acquire Businesses, Net of Cash Acquired   $ 3,500  
SoftBank Merger [Member]      
Nature of Operations [Line Items]      
Payments to Acquire Businesses, Net of Cash Acquired $ 14,100    
Convertible Debt     $ 3,100
Clearwire [Member] | Clearwire Acquisition [Member]      
Nature of Operations [Line Items]      
Business acquisition, share price   $ 5.00