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Related Party Transactions (Brightstar) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Nov. 30, 2015
Related Party Transaction [Line Items]          
Document Period End Date   Jun. 30, 2017      
Brightstar [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Expenses from Transactions with Related Party   $ 23 $ 19    
Accounts receivable   185   $ 367  
Accounts payable   61   $ 160  
Revenue from Related Parties   350 276    
Related Party Costs   356 296    
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        
Repayments of Debt   117      
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months   1,800      
Subsidiaries [Member] | Brightstar [Member]          
Related Party Transaction [Line Items]          
Revenue from Related Parties   9 $ 28    
SoftBank [Member]          
Related Party Transaction [Line Items]          
Equity Method Investment, Aggregate Cost   $ 39     $ 79
SoftBank [Member] | Network Sale-Leaseback [Member]          
Related Party Transaction [Line Items]          
Sale Leaseback Transaction, Net Proceeds, Financing Activities $ 250