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Reconciliation of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) (JPY ¥)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Trading securities
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance   ¥ 24   ¥ 53
Gains or losses (realized/ unrealized), included in earnings       (26) [1]
Gains or losses (realized/ unrealized), included in other comprehensive income   1   (2)
Gains or losses (realized/ unrealized), total   1   (28)
Purchase, sales, and settlements (net)   (25)   (25)
Available-for-sale securities
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 292,909 308,955 315,676 401,804
Gains or losses (realized/ unrealized), included in earnings (520) [1] (922) [1] (1,851) [1] (7,705) [1]
Gains or losses (realized/ unrealized), included in other comprehensive income 1,939 (1,971) (632) (3,192)
Gains or losses (realized/ unrealized), total 1,419 (2,893) (2,483) (10,897)
Purchases 14,346   53,681  
Sales (6,452)   (6,777)  
Settlements (30,379)   (88,254)  
Purchase, sales, and settlements (net)   (6,024)   (47,333)
Transfers in and/ or out of Level 3 (net)       (43,536) [2]
Ending Balance 271,843 300,038 271,843 300,038
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period (978) [1] (889) [1] (2,487) [1] (7,733) [1]
Available-for-sale securities | Corporate debt securities
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 2,681 3,147 2,573 6,841
Gains or losses (realized/ unrealized), included in earnings (37) [1] (22) [1] (105) [1] 10 [1]
Gains or losses (realized/ unrealized), included in other comprehensive income 17 (4) 203 (66)
Gains or losses (realized/ unrealized), total (20) (26) 98 (56)
Purchases 546   2,549  
Settlements (318)   (2,331)  
Purchase, sales, and settlements (net)   (473)   (2,080)
Transfers in and/ or out of Level 3 (net)       (2,057) [2]
Ending Balance 2,889 2,648 2,889 2,648
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period (37) [1] (23) [1] (108) [1] (23) [1]
Available-for-sale securities | Specified bonds issued by SPEs in Japan
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 180,191 213,852 222,314 246,305
Gains or losses (realized/ unrealized), included in earnings (1,576) [1] (183) [1] (3,451) [1] (4,993) [1]
Gains or losses (realized/ unrealized), included in other comprehensive income 964 (148) 3,112 1,491
Gains or losses (realized/ unrealized), total (612) (331) (339) (3,502)
Purchases 100   100  
Sales (10)   (10)  
Settlements (17,273)   (59,669)  
Purchase, sales, and settlements (net)   (4,262)   (41,473)
Transfers in and/ or out of Level 3 (net)       7,929 [2]
Ending Balance 162,396 209,259 162,396 209,259
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period (1,601) [1] (215) [1] (3,476) [1] (5,031) [1]
Available-for-sale securities | CMBS and RMBS in the U.S., and other asset-backed securities
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 99,624 86,462 85,283 143,176
Gains or losses (realized/ unrealized), included in earnings 1,093 [1] (717) [1] 1,705 [1] (2,722) [1]
Gains or losses (realized/ unrealized), included in other comprehensive income 785 (1,825) (3,336) (4,635)
Gains or losses (realized/ unrealized), total 1,878 (2,542) (1,631) (7,357)
Purchases 13,700   45,341  
Sales (6,442)   (6,767)  
Settlements (9,788)   (23,254)  
Purchase, sales, and settlements (net)   (1,289)   (3,780)
Transfers in and/ or out of Level 3 (net)       (49,408) [2]
Ending Balance 98,972 82,631 98,972 82,631
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 660 [1] (651) [1] 1,097 [1] (2,679) [1]
Available-for-sale securities | Other Debt Securities
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 10,413 5,494 5,506 5,482
Gains or losses (realized/ unrealized), included in other comprehensive income 173 6 (611) 18
Gains or losses (realized/ unrealized), total 173 6 (611) 18
Purchases     5,691  
Settlements (3,000)   (3,000)  
Ending Balance 7,586 5,500 7,586 5,500
Derivative assets and liabilities (net)
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 3,253 3,288 2,946 493
Gains or losses (realized/ unrealized), included in earnings 463 [1] (2,204) [1] 592 [1] (2,068) [1]
Gains or losses (realized/ unrealized), total 463 (2,204) 592 (2,068)
Settlements 10   188  
Transfers in and/ or out of Level 3 (net)       2,659 [2]
Ending Balance 3,726 1,084 3,726 1,084
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 463 [1] (2,204) [1] 592 [1] (2,068) [1]
Derivative assets and liabilities (net) | Options held/written, caps held and other
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 3,263 2,720 3,134  
Gains or losses (realized/ unrealized), included in earnings 463 [1] (1,682) [1] 592 [1] (1,621) [1]
Gains or losses (realized/ unrealized), total 463 (1,682) 592 (1,621)
Transfers in and/ or out of Level 3 (net)       2,659 [2]
Ending Balance 3,726 1,038 3,726 1,038
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 463 [1] (1,682) [1] 592 [1] (1,621) [1]
Derivative assets and liabilities (net) | Credit derivatives held/written
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance (10) 568 (188) 493
Gains or losses (realized/ unrealized), included in earnings   (522) [1]   (447) [1]
Gains or losses (realized/ unrealized), total   (522)   (447)
Settlements 10   188  
Ending Balance   46   46
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period   ¥ (522) [1]   ¥ (447) [1]
[1] Principally, gains and losses from trading securities are included in brokerage commissions and net gains on investment securities; available-for-sale securities are included in write-downs of securities or life insurance premiums and related investment income and derivative assets and liabilities (net) are included in other operating revenues/expenses, respectively. Also, for available-for-sale securities, amortizations of interest recognized in interest on loans and investment securities are included in these columns.
[2] The amount reported in "Transfers in and/or out of Level 3 (net)" is the fair value at the beginning of quarter during which the transfers occur.