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Equity - Additional Information (Detail) - JPY (¥)
¥ / shares in Units, ¥ in Millions
12 Months Ended
Feb. 12, 2014
Mar. 31, 2016
Jun. 27, 2016
EQUITY      
Appropriated legal reserve included in retained earnings   ¥ 19,276  
Percentage of cash dividends set aside as legal reserve   10.00%  
Percentage of legal reserve set aside as an appropriation of retained earnings and additional paid-in capital over stated capital   25.00%  
Amount of statutory retained earnings available for the payment of dividends   ¥ 859,594  
Treasury stock, shares, retired 5,000,000    
Dividends payable date   Jun. 27, 2016  
Dividends approval date   Jun. 24, 2016  
Equity in retained earnings or deficits of affiliates and unconsolidated subsidiaries   ¥ (1,977)  
Subsequent Event      
EQUITY      
Dividends payable, per share     ¥ 50
Dividends payable     ¥ 18,343