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Investment In and Advances To Non-Consolidated Affiliates and Related Party Transactions (Details1) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Mar. 31, 2014
Related Party Transaction [Line Items]    
Accounts receivable - related parties $ 61 $ 54
Long-term receivables from related parties, carrying value 21 12
Accounts payable 56 53
Alunorf [Member]
   
Related Party Transaction [Line Items]    
Accounts receivable - related parties   54
Long-term receivables from related parties, carrying value   12
Accounts payable   $ 53