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Investments (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
9 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2013
Jul. 10, 2013
Clearwire [Member]
Sep. 30, 2012
Clearwire [Member]
Jul. 10, 2013
Clearwire [Member]
Sep. 30, 2012
Clearwire [Member]
Jul. 08, 2013
Clearwire [Member]
Jul. 08, 2013
Non-controlling economic interest [Member]
Clearwire Corporation [Member]
Jul. 08, 2013
Non-controlling economic interest [Member]
Clearwire Communications LLC [Member]
Dec. 17, 2012
Clearwire Acquisition [Member]
Jul. 09, 2013
Clearwire Acquisition [Member]
Clearwire Corporation [Member]
Jul. 09, 2013
Clearwire Acquisition [Member]
Clearwire [Member]
Jul. 08, 2013
Clearwire Acquisition [Member]
Non-controlling economic interest [Member]
Schedule of Equity Method Investments [Line Items]                        
Sprint share in percentage of non-controlling interest in Clearwire             2.10% 48.00%       50.10%
Carrying value of non-controlling interest           $ 325            
Equity Method Investment, Other than Temporary Impairment     204                  
Exchangeable notes, related party                 800      
Amount of individual draw of exchangeable note issued by investee                 80      
Common Stock, Par or Stated Value Per Share                   $ 0    
Asset impairments 0       41              
Related Party Transaction, Amounts of Transaction   11 103 207 312              
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net       65                
Gain on previously-held equity interests       $ (2,900)                
Business Acquisition, Share Price                     $ 5.00