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Related Party Transactions (Brightstar) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Nov. 30, 2015
Related Party Transaction [Line Items]              
Document Period End Date       Sep. 30, 2017      
Brightstar [Member]              
Related Party Transaction [Line Items]              
Related Party Transaction, Expenses from Transactions with Related Party   $ 23 $ 9 $ 46 $ 28    
Accounts receivable   243   243   $ 367  
Accounts payable   106   106   $ 160  
Revenue from Related Parties   443 351 793 627    
Related Party Costs   452 322 808 618    
Related Party Transaction, Other Revenues from Transactions with Related Party   29          
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   1,800      
Subsidiaries [Member] | Brightstar [Member]              
Related Party Transaction [Line Items]              
Revenue from Related Parties   8 $ 26 17 $ 54    
SoftBank [Member]              
Related Party Transaction [Line Items]              
Equity Method Investment, Aggregate Cost   $ 39   $ 39     $ 79
SoftBank [Member] | Network Sale-Leaseback [Member]              
Related Party Transaction [Line Items]              
Sale Leaseback Transaction, Net Proceeds, Financing Activities $ 250