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Related Party Transactions (Brightstar) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Nov. 30, 2015
Related Party Transaction [Line Items]          
Document Period End Date   Jun. 30, 2016      
Sale Leaseback Transaction, Net Proceeds, Financing Activities     $ 600    
Brightstar [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Expenses from Transactions with Related Party   $ 19   $ 33  
Accounts receivable   184 197    
Accounts payable   70 $ 96    
Revenue from Related Parties   276   375  
Related Party Costs   $ 296   $ 418  
MLS [Member]          
Related Party Transaction [Line Items]          
Sale Leaseback Transaction, Net Proceeds, Financing Activities $ 2,200        
Network Sale-Leaseback [Member]          
Related Party Transaction [Line Items]          
Sale Leaseback Transaction, Net Proceeds, Financing Activities 2,200        
SoftBank [Member]          
Related Party Transaction [Line Items]          
Equity Method Investment, Aggregate Cost         $ 79
SoftBank [Member] | Network Sale-Leaseback [Member]          
Related Party Transaction [Line Items]          
Sale Leaseback Transaction, Net Proceeds, Financing Activities $ 300