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Information about Available-for-Sale Securities and Held-to-Maturity Securities with Gross Unrealized Losses and Length of Time Individual Securities Have Been in Continuous Unrealized Loss Position (Detail) (JPY ¥)
In Millions, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value ¥ 230,884 ¥ 107,836
Less than 12 months Gross unrealized losses (816) (382)
12 months or more Fair value 30,722 59,014
12 months or more Gross unrealized losses (1,650) (3,986)
Total Fair value 261,606 166,850
Total Gross unrealized losses (2,466) (4,368)
Japanese and foreign government bond securities
    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 140,133 85,842
Less than 12 months Gross unrealized losses (10) (21)
12 months or more Fair value 14,977 0
12 months or more Gross unrealized losses (8) 0
Total Fair value 155,110 85,842
Total Gross unrealized losses (18) (21)
Japanese prefectural and foreign municipal bond securities
    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 31,407 10,118
Less than 12 months Gross unrealized losses (143) 0
12 months or more Fair value 0 0
12 months or more Gross unrealized losses 0 0
Total Fair value 31,407 10,118
Total Gross unrealized losses (143) 0
Corporate debt securities
    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 27,496 4,490
Less than 12 months Gross unrealized losses (31) (69)
12 months or more Fair value 10,968 16,329
12 months or more Gross unrealized losses (524) (878)
Total Fair value 38,464 20,819
Total Gross unrealized losses (555) (947)
Specified bonds issued by SPEs in Japan
    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 0 3,929
Less than 12 months Gross unrealized losses 0 (106)
12 months or more Fair value 2,138 34,226
12 months or more Gross unrealized losses (148) (925)
Total Fair value 2,138 38,155
Total Gross unrealized losses (148) (1,031)
CMBS and RMBS in the U.S., and other asset-backed securities
    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 15,891 2,142
Less than 12 months Gross unrealized losses (91) (44)
12 months or more Fair value 2,540 8,141
12 months or more Gross unrealized losses (950) (2,164)
Total Fair value 18,431 10,283
Total Gross unrealized losses (1,041) (2,208)
Equity securities
    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 15,957 1,315
Less than 12 months Gross unrealized losses (541) (142)
12 months or more Fair value 99 318
12 months or more Gross unrealized losses (20) (19)
Total Fair value 16,056 1,633
Total Gross unrealized losses ¥ (561) ¥ (161)