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FINANCIAL INSTRUMENTS (Fair Value of Short-Term Investments Schedules) (Details) (USD $)
In Millions
Jun. 30, 2011
Mar. 31, 2011
Short-term investments $ 503 $ 497 [1]
Commercial Paper [Member] | Short-term Investments [Member]
   
Adjusted Cost 25 18
Gross Unrealized Losses    
Short-term investments 25 18
U.S. Treasury Securities [Member] | Short-term Investments [Member]
   
Adjusted Cost 117 124
Gross Unrealized Gains 1  
Gross Unrealized Losses    
Short-term investments 118 124
U.S. Agency Securities [Member] | Short-term Investments [Member]
   
Adjusted Cost 117 102
Gross Unrealized Gains 1  
Gross Unrealized Losses    
Short-term investments 118 102
Corporate Bonds [Member] | Short-term Investments [Member]
   
Adjusted Cost 241 252
Gross Unrealized Gains 1 1
Gross Unrealized Losses    
Short-term investments 242 253
Short-term Investments [Member]
   
Adjusted Cost 500 496
Gross Unrealized Gains 3 1
Gross Unrealized Losses    
Short-term investments $ 503 $ 497
[1] Derived from audited consolidated financial statements.