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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Oct. 31, 2014
Related Party Transaction [Line Items]        
Document Period End Date Jun. 30, 2018      
Cost of equipment sales $ 1,270 $ 1,545    
Line of Credit [Member] | Brightstar [Member]        
Related Party Transaction [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity       $ 700
Brightstar [Member]        
Related Party Transaction [Line Items]        
Revenue from Related Parties 413 350    
Accounts Receivable, Related Parties 125   $ 188  
Related Party Transaction, Expenses from Transactions with Related Party 17 23    
Accounts Payable, Related Parties, Current 79   $ 88  
Cost of equipment sales $ 432 $ 356