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Related Party Transactions (Brightstar) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2017
Nov. 30, 2015
Related Party Transaction [Line Items]              
Document Period End Date       Dec. 31, 2017      
Brightstar [Member]              
Related Party Transaction [Line Items]              
Related Party Transaction, Expenses from Transactions with Related Party   $ 25 $ 15 $ 71 $ 43    
Accounts receivable   253   253   $ 367  
Accounts payable   119   119   $ 160  
Related Party Transaction, Other Revenues from Transactions with Related Party   71   100      
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       1,400      
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months   454   454      
Subsidiaries [Member] | Brightstar [Member]              
Related Party Transaction [Line Items]              
Revenue from Related Parties   10 23 27 77    
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 $ 250            
Sales Revenue, Services, Net [Member] | Brightstar [Member]              
Related Party Transaction [Line Items]              
Revenue from Related Parties   71 0 100 0    
Sales Revenue, Goods, Net [Member] | Brightstar [Member]              
Related Party Transaction [Line Items]              
Revenue from Related Parties   639 480 1,432 1,107    
Cost of Goods, Total [Member] | Brightstar [Member]              
Related Party Transaction [Line Items]              
Related Party Costs   657 403 1,465 1,021    
Selling, General and Administrative Expenses [Member] | Brightstar [Member]              
Related Party Transaction [Line Items]              
Related Party Costs   $ 13 $ 9 $ 39 $ 26