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Subsequent Events (Details) (Sprint Merger Proposal, Subsequent event, USD $)
Apr. 15, 2013
Apr. 12, 2013
Sprint Merger Proposal | Subsequent event
   
Subsequent Events    
Total consideration $ 25,500,000,000  
Consideration in cash 17,300,000,000  
Consideration in stock $ 8,200,000,000  
Share price (in dollars per share)   $ 7.00
Cash portion of acquisition price (in dollars per share)   $ 4.76
Ratio of shares issued for each share acquired   0.05953
Ownership in combined entity represented by equity interests issued (as a percentage) 32.00%