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Share Repurchases (Detail) (Share Repurchase Program, USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Share Repurchase Program
       
Share Repurchases [Line Items]        
Shares of common stock repurchased 36 31 127 109
Value of common stock repurchased $ 1,000 $ 1,000 $ 3,607 $ 3,000