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FINANCIAL INSTRUMENTS (Fair Value of Marketable Equity Securities Schedule) (Details) (USD $)
In Millions
Jun. 30, 2011
Mar. 31, 2011
Fair Value $ 172 $ 161 [1]
Marketable Equity Securities [Member]
   
Adjusted cost 32 32
Gross Unrealized Gains 140 129
Fair Value $ 172 $ 161
[1] Derived from audited consolidated financial statements.