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Information about Available-for-Sale Securities and Held-to-Maturity Securities with Gross Unrealized Losses and the Length of Time that Individual Securities Have Been in a Continuous Unrealized Loss Position (Detail) (JPY ¥)
In Millions, unless otherwise specified
Dec. 31, 2011
Mar. 31, 2011
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value ¥ 180,692 ¥ 337,103
Less than 12 months Gross unrealized losses (10,783) (6,680)
12 months or more Fair value 71,842 83,545
12 months or more Gross unrealized losses (5,931) (4,925)
Total Fair value 252,534 420,648
Total Gross unrealized losses (16,714) (11,605)
Available-for-sale securities
    
Investments, Unrealized Loss Position [Line Items]    
Total Gross unrealized losses (16,714) (11,605)
Available-for-sale securities | Japanese and foreign government bond securities
    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 54,383 63,438
Less than 12 months Gross unrealized losses (6) (169)
Total Fair value 54,383 63,438
Total Gross unrealized losses (6) (169)
Available-for-sale securities | Japanese prefectural and foreign municipal bond securities
    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 15,507 22,444
Less than 12 months Gross unrealized losses (66) (92)
Total Fair value 15,507 22,444
Total Gross unrealized losses (66) (92)
Available-for-sale securities | Corporate debt securities
    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 67,631 184,185
Less than 12 months Gross unrealized losses (3,788) (2,071)
12 months or more Fair value 16,885 1,980
12 months or more Gross unrealized losses (203) (20)
Total Fair value 84,516 186,165
Total Gross unrealized losses (3,991) (2,091)
Available-for-sale securities | Specified bonds issued by SPEs in Japan
    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 900 49,180
Less than 12 months Gross unrealized losses   (2,025)
12 months or more Fair value 32,483 49,398
12 months or more Gross unrealized losses (634) (1,100)
Total Fair value 33,383 98,578
Total Gross unrealized losses (634) (3,125)
Available-for-sale securities | CMBS and RMBS in the U.S., and other asset-backed securities
    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 23,252 6,660
Less than 12 months Gross unrealized losses (117) (853)
12 months or more Fair value 13,149 24,288
12 months or more Gross unrealized losses (3,320) (2,990)
Total Fair value 36,401 30,948
Total Gross unrealized losses (3,437) (3,843)
Available-for-sale securities | Other Debt Securities
    
Investments, Unrealized Loss Position [Line Items]    
12 months or more Fair value   2,988
12 months or more Gross unrealized losses   (12)
Total Fair value   2,988
Total Gross unrealized losses   (12)
Available-for-sale securities | Equity securities
    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 19,019 11,196
Less than 12 months Gross unrealized losses (6,806) (1,470)
12 months or more Fair value 9,325 4,891
12 months or more Gross unrealized losses (1,774) (803)
Total Fair value 28,344 16,087
Total Gross unrealized losses ¥ (8,580) ¥ (2,273)