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Recorded Amounts of Major Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (JPY ¥)
In Millions, unless otherwise specified
Dec. 31, 2011
Mar. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets ¥ 19,666 ¥ 22,985
Financial assets 948,201 988,409
Derivative liabilities 9,595 42,076
Financial liabilities 9,595 42,076
Interest rate swap agreements
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 4,625 2,070
Derivative liabilities 1,433 1,320
Options held/written, caps held and other
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 4,101 3,467
Derivative liabilities 2,678 2,071
Futures, Foreign exchange contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 2,107 2,633
Derivative liabilities 1,793 4,968
Foreign currency swap agreements
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 8,671 14,766
Derivative liabilities 3,687 33,481
Credit derivatives held/written
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 162 49
Derivative liabilities 4 236
Trading securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 33,818 71,991
Available-for-sale securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 880,582 883,410
Available-for-sale securities | Japanese and foreign government bond securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 173,482 169,345
Available-for-sale securities | Japanese prefectural and foreign municipal bond securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 58,644 34,968
Available-for-sale securities | Corporate debt securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 306,217 292,032
Available-for-sale securities | Specified bonds issued by SPEs in Japan
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 162,396 222,314
Available-for-sale securities | CMBS and RMBS in the U.S., and other asset-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 100,591 87,874
Available-for-sale securities | Other Debt Securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 7,586 5,506
Available-for-sale securities | Equity securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 71,666 71,371
Other securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 5,239 10,023
Other securities | Investment funds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 5,239 10,023
Loans Held-for-Sale
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 8,896 [1]  
Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 559 1,306
Financial assets 107,832 76,983
Derivative liabilities 557 977
Financial liabilities 557 977
Level 1 | Futures, Foreign exchange contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 559 1,306
Derivative liabilities 557 977
Level 1 | Trading securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 166 763
Level 1 | Available-for-sale securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 107,107 74,914
Level 1 | Available-for-sale securities | Japanese and foreign government bond securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 50,321 19,995
Level 1 | Available-for-sale securities | Japanese prefectural and foreign municipal bond securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 27  
Level 1 | Available-for-sale securities | Equity securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 56,759 54,919
Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 15,381 18,497
Financial assets 564,800 592,568
Derivative liabilities 9,038 40,863
Financial liabilities 9,038 40,863
Level 2 | Interest rate swap agreements
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 4,625 2,070
Derivative liabilities 1,433 1,320
Level 2 | Options held/written, caps held and other
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 375 333
Derivative liabilities 2,678 2,071
Level 2 | Futures, Foreign exchange contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 1,548 1,327
Derivative liabilities 1,236 3,991
Level 2 | Foreign currency swap agreements
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 8,671 14,766
Derivative liabilities 3,687 33,481
Level 2 | Credit derivatives held/written
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 162 1
Derivative liabilities 4  
Level 2 | Trading securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 33,652 71,228
Level 2 | Available-for-sale securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 501,632 492,820
Level 2 | Available-for-sale securities | Japanese and foreign government bond securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 123,161 149,350
Level 2 | Available-for-sale securities | Japanese prefectural and foreign municipal bond securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 58,617 34,968
Level 2 | Available-for-sale securities | Corporate debt securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 303,328 289,459
Level 2 | Available-for-sale securities | CMBS and RMBS in the U.S., and other asset-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 1,619 2,591
Level 2 | Available-for-sale securities | Equity securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 14,907 16,452
Level 2 | Other securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 5,239 10,023
Level 2 | Other securities | Investment funds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 5,239 10,023
Level 2 | Loans Held-for-Sale
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 8,896 [1]  
Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 3,726 3,182
Financial assets 275,569 318,858
Derivative liabilities   236
Financial liabilities   236
Level 3 | Options held/written, caps held and other
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 3,726 3,134
Level 3 | Credit derivatives held/written
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets   48
Derivative liabilities   236
Level 3 | Available-for-sale securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 271,843 315,676
Level 3 | Available-for-sale securities | Corporate debt securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 2,889 2,573
Level 3 | Available-for-sale securities | Specified bonds issued by SPEs in Japan
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 162,396 222,314
Level 3 | Available-for-sale securities | CMBS and RMBS in the U.S., and other asset-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 98,972 85,283
Level 3 | Available-for-sale securities | Other Debt Securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments ¥ 7,586 ¥ 5,506
[1] A subsidiary elected the fair value option under ASC825-10 ("Financial Instruments-Fair Value Option") on the loans held for sale originated on and after October 1, 2011. These loans are multi-family and seniors housing loans and are sold to Federal National Mortgage Association ("Fannie Mae") or institutional investors. Included in other operating revenues in the consolidated statements of income are gains from the change in the fair value of the loans of ¥404 million and ¥404 million, for the nine months ended December 31, 2011 and for the three months ended December 31, 2011, respectively. No gains or losses were recognized in earnings during the nine months ended December 31, 2011 and for the three months ended December 31, 2011, attributable to changes in instrument-specific credit risk. The amounts of aggregate unpaid principal balance and aggregate fair value at December 31, 2011, are ¥8,492 million and ¥8,896 million, respectively, and the amount of aggregate fair value exceeds the amount of aggregate unpaid principal balance by ¥404 million. There are no loans that are 90 days or more past due, in non-accrual status, or both.