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Related Party Transactions Related Party Transactions - Brightstar Subsidiary (Details) (Successor [Member], Brightstar Subsidiary [Member], USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Mar. 31, 2014
Successor [Member] | Brightstar Subsidiary [Member]
   
Related Party Transaction [Line Items]    
Inventories, related party $ 704 $ 266
Accounts payable $ 418 $ 205