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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2011
Mar. 31, 2010
Tax effect on unrealized gain (loss) on derivatives   $ 1
Tax effect on realized loss (gain) on derivatives 2  
Accumulated Other Comprehensive (Loss) Income
   
Tax effect on unrealized gain (loss) on derivatives   1
Tax effect on realized loss (gain) on derivatives $ 2