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Related Party Transactions (Brightstar) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Related Party Transaction [Line Items]      
Document Period End Date Jun. 30, 2018    
Cost of equipment sales $ 1,270 $ 1,545  
Brightstar [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expenses from Transactions with Related Party 17 23  
Accounts Receivable, Related Parties 125   $ 188
Accounts Payable, Related Parties, Current 79   $ 88
Revenue from Related Parties 413 350  
Related Party Transaction, Other Revenues from Transactions with Related Party 49    
Cost of equipment sales $ 432 $ 356