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Segment Information (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Segment Reporting Information [Line Items]    
Litigation charges $ 15 $ 16
Gain on Business Combination 0 81
Distribution Solutions [Member]
   
Segment Reporting Information [Line Items]    
Percentage of Revenue Derived From Services less than 2% less than 2%
Corporate [Member]
   
Segment Reporting Information [Line Items]    
Gain on Business Combination   81
Average Wholesale Price Litigation [Member]
   
Segment Reporting Information [Line Items]    
Litigation charges 15 16
Average Wholesale Price Litigation [Member] | Operating Expense [Member] | Distribution Solutions [Member]
   
Segment Reporting Information [Line Items]    
Litigation charges $ 15 $ 16