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Investment In and Advances To Non-Consolidated Affiliates and Related Party Transactions (Details1) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Mar. 31, 2014
Related Party Transaction [Line Items]    
Accounts receivable-related parties $ 60 $ 54
Other long-term assets-related parties 10 12
Accounts payable-related parties 53 53
Alunorf [Member]
   
Related Party Transaction [Line Items]    
Accounts receivable-related parties 60 54
Other long-term assets-related parties 10 12
Accounts payable-related parties $ 53 $ 53