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Basis of Presentation Basis of Presentation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jul. 10, 2013
SoftBank Merger [Member]
Oct. 22, 2012
SoftBank Merger [Member]
Jul. 09, 2013
Clearwire Acquisition [Member]
Jul. 09, 2013
Clearwire [Member]
Clearwire Acquisition [Member]
Organization And Basis Of Presentation [Line Items]        
Convertible Debt   $ 3,100    
Business Acquisition, Percentage of Voting Interests Acquired 80.00%      
Payments to Acquire Equity Method Investments     $ 3,681  
Business Acquisition, Share Price       $ 5.00
Debt Instrument, Interest Rate, Stated Percentage   1.00%    
Number of Stock that will be issued, Shares, Conversion Of Convertible Securities   590,476,190    
Debt Instrument, Convertible, Conversion Price   $ 5.25