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Redeemable Preferred Stock - Additional Information (Detail) - Redeemable Preferred Stock [Member] - USD ($)
$ / shares in Units, $ in Millions
Jun. 28, 2013
Jun. 30, 2016
Jun. 30, 2015
Class of Stock [Line Items]      
Preferred stock sold 4,000    
Preferred stock, par value $ 5,000    
Preferred stock dividend rate 9.50%    
Redeemable Preferred Stock on Balance Sheet   $ 20 $ 20
Call Option [Member]      
Class of Stock [Line Items]      
Preferred stock redemption period 5 years    
Put Option [Member]      
Class of Stock [Line Items]      
Preferred stock redemption period 10 years