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Reconciliation of Financial Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Detail) (JPY ¥)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Ending Balance ¥ 92,804 ¥ 144,877  
Available-for-sale securities
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance 136,978 243,655 315,676
Gains or losses (realized/ unrealized), included in earnings 4,364 [1] (9,225) [1] (1,262) [1]
Gains or losses (realized/ unrealized), included in other comprehensive income 4,056 [2] 7,693 [2] 1,443 [2]
Gains or losses (realized/ unrealized), total 8,420 (1,532) 181
Purchases 56,202 19,294 63,980
Sales (13,817) (10,564) (18,054)
Settlements (103,782) (113,875) (118,596)
Transfers in and/or out of Level 3 (net) 0 [3] 0 [3] 468 [3]
Ending Balance 84,001 136,978 243,655
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 180 [1] (9,783) [1] (2,429) [1]
Available-for-sale securities | Corporate debt securities
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance 6,524 2,912 2,573
Gains or losses (realized/ unrealized), included in earnings 416 [1] (508) [1] (18) [1]
Gains or losses (realized/ unrealized), included in other comprehensive income (356) [2] 908 [2] 108 [2]
Gains or losses (realized/ unrealized), total 60 400 90
Purchases 0 3,942 2,549
Sales (1,325) (432) (431)
Settlements (4,598) (298) (2,337)
Transfers in and/or out of Level 3 (net) 0 [3] 0 [3] 468 [3]
Ending Balance 661 6,524 2,912
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 0 [1] (456) [1] (35) [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 63,244 139,152 222,314
Gains or losses (realized/ unrealized), included in earnings 327 [1] (9,228) [1] (3,066) [1]
Gains or losses (realized/ unrealized), included in other comprehensive income 839 [2] (15) [2] 2,178 [2]
Gains or losses (realized/ unrealized), total 1,166 (9,243) (888)
Purchases 0 5,419 6,668
Sales (36) (9) (9,625)
Settlements (57,602) (72,075) (79,317)
Transfers in and/or out of Level 3 (net) 0 [3] 0 [3] 0 [3]
Ending Balance 6,772 63,244 139,152
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 5 [1] (8,095) [1] (3,397) [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 58,899 93,181 85,283
Gains or losses (realized/ unrealized), included in earnings 3,621 [1] (369) [1] 1,822 [1]
Gains or losses (realized/ unrealized), included in other comprehensive income 1,334 [2] 5,381 [2] (1,056) [2]
Gains or losses (realized/ unrealized), total 4,955 5,012 766
Purchases 55,202 9,933 49,072
Sales (12,456) (7,725) (7,998)
Settlements (41,582) (41,502) (33,942)
Transfers in and/or out of Level 3 (net) 0 [3] 0 [3] 0 [3]
Ending Balance 65,018 58,899 93,181
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 175 [1] (1,232) [1] 1,003 [1]
Available-for-sale securities | Other Debt Securities
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance 8,311 8,410 5,506
Gains or losses (realized/ unrealized), included in earnings 0 [1] 880 [1] 0 [1]
Gains or losses (realized/ unrealized), included in other comprehensive income 2,239 [2] 1,419 [2] 213 [2]
Gains or losses (realized/ unrealized), total 2,239 2,299 213
Purchases 1,000 0 5,691
Sales 0 (2,398) 0
Settlements 0 0 (3,000)
Transfers in and/or out of Level 3 (net) 0 [3] 0 [3] 0 [3]
Ending Balance 11,550 8,311 8,410
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 0 [1] 0 [1] 0 [1]
Derivative Financial Instruments, Assets and Liabilities
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance 2,099 5,293 2,946
Gains or losses (realized/ unrealized), included in earnings 2,987 [1] (3,194) [1] 2,159 [1]
Gains or losses (realized/ unrealized), included in other comprehensive income 0 [2] 0 [2] 0 [2]
Gains or losses (realized/ unrealized), total 2,987 (3,194) 2,159
Purchases 0 0 0
Sales 0 0 0
Settlements (2,600) 0 188
Transfers in and/or out of Level 3 (net) 0 [3] 0 [3] 0 [3]
Ending Balance 2,486 2,099 5,293
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 2,987 [1] (3,194) [1] 2,159 [1]
Derivative Financial Instruments, Assets and Liabilities | Options Held (Written) and Other
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance 2,099 5,293 3,134
Gains or losses (realized/ unrealized), included in earnings 2,987 [1] (3,194) [1] 2,159 [1]
Gains or losses (realized/ unrealized), included in other comprehensive income 0 [2] 0 [2] 0 [2]
Gains or losses (realized/ unrealized), total 2,987 (3,194) 2,159
Purchases 0 0 0
Sales 0 0 0
Settlements (2,600) 0 0
Transfers in and/or out of Level 3 (net) 0 [3] 0 [3] 0 [3]
Ending Balance 2,486 2,099 5,293
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 2,987 [1] (3,194) [1] 2,159 [1]
Derivative Financial Instruments, Assets and Liabilities | Credit derivatives held/written
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance     (188)
Gains or losses (realized/ unrealized), included in earnings     0 [1]
Gains or losses (realized/ unrealized), included in other comprehensive income     0 [2]
Gains or losses (realized/ unrealized), total     0
Purchases     0
Sales     0
Settlements     188
Transfers in and/or out of Level 3 (net)     0 [3]
Ending Balance     0
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period     0 [1]
Other securities
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance 5,800 0  
Gains or losses (realized/ unrealized), included in earnings 1,767 [1] 670 [1]  
Gains or losses (realized/ unrealized), included in other comprehensive income 584 [2] 825 [2]  
Gains or losses (realized/ unrealized), total 2,351 1,495  
Purchases 2,013 5,018  
Sales (3,824) (713)  
Settlements (23) 0  
Transfers in and/or out of Level 3 (net) 0 [3] 0 [3]  
Ending Balance 6,317 5,800  
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 1,767 [1] 670 [1]  
Other securities | Investment funds
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance 5,800 0  
Gains or losses (realized/ unrealized), included in earnings 1,767 [1] 670 [1]  
Gains or losses (realized/ unrealized), included in other comprehensive income 584 [2] 825 [2]  
Gains or losses (realized/ unrealized), total 2,351 1,495  
Purchases 2,013 5,018  
Sales (3,824) (713)  
Settlements (23) 0  
Transfers in and/or out of Level 3 (net) 0 [3] 0 [3]  
Ending Balance 6,317 5,800  
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 1,767 [1] 670 [1]  
Accounts Payable
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance 0    
Gains or losses (realized/ unrealized), included in earnings 2,343 [1]    
Gains or losses (realized/ unrealized), included in other comprehensive income 0 [2]    
Gains or losses (realized/ unrealized), total 2,343    
Purchases 5,176    
Sales 0    
Settlements 0    
Transfers in and/or out of Level 3 (net) 0 [3]    
Ending Balance 2,833    
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period 2,343 [1]    
Accounts Payable | Contingent consideration
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance 0    
Gains or losses (realized/ unrealized), included in earnings 2,343 [1]    
Gains or losses (realized/ unrealized), included in other comprehensive income 0 [2]    
Gains or losses (realized/ unrealized), total 2,343    
Purchases 5,176    
Sales 0    
Settlements 0    
Transfers in and/or out of Level 3 (net) 0 [3]    
Ending Balance 2,833    
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period ¥ 2,343 [1]    
[1] Principally, gains and losses from available-for-sale securities are included in "brokerage commissions and net gains on investment securities", "write-downs of securities" or "life insurance premiums and related investment income"; other securities are included in "brokerage commissions and net gains on investment securities" and derivative assets and liabilities (net) are included in "other operating revenues/expenses," and gains from accounts payable are included in "other operating revenues". Also, for available-for-sale securities, amortization of interest recognized in interest on loans and investment securities is included in these columns.
[2] Unrealized gains and losses from available-for-sale securities are included in "Net change of unrealized gains (losses) on investment in securities."
[3] 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.