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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, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Nov. 30, 2015
Related Party Transaction [Line Items]              
Document Period End Date         Sep. 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   $ 9   $ 20 $ 28 $ 53  
Accounts receivable   144 197   144    
Accounts payable   66 $ 96   66    
Revenue from Related Parties   351   402 627 777  
Related Party Costs   322   $ 343 618 $ 761  
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            
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months   300     300    
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two   $ 1,900     $ 1,900    
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