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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Aug. 05, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Subsequent Event [Line Items]        
Common shares repurchased, amount   $ 651 $ 1,036 $ 673
Subsequent Event        
Subsequent Event [Line Items]        
Number of common shares repurchased 3,000,000      
Common shares repurchased, amount $ 250      
Average price per common share (in usd per share) $ 81.45