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Significant Accounting Policies (Tables)
12 Months Ended
Mar. 31, 2012
Significant Accounting Policies [Abstract]  
Additional Information Regarding Capitalized Software Expenditures
             
      Years Ended March 31,  
(In millions)   2012   2011   2010
Amounts capitalized $ 47 $ 64 $ 75
Amortization expense   53   75   67
Impairment charge   0   72   0
Third-party royalty fees paid   95   72   63