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Reconciliation of Financial Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) In Millions | 12 Months Ended
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Mar. 31, 2011 Trading securities USD ($) | Mar. 31, 2011 Trading securities JPY (¥) | Mar. 31, 2010 Trading securities JPY (¥) | Mar. 31, 2009 Trading securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities USD ($) | Mar. 31, 2011 Available-for-sale securities JPY (¥) | Mar. 31, 2010 Available-for-sale securities JPY (¥) | Mar. 31, 2009 Available-for-sale securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities Corporate debt securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities Corporate debt securities USD ($) | Mar. 31, 2010 Available-for-sale securities Corporate debt securities JPY (¥) | Mar. 31, 2009 Available-for-sale securities Corporate debt securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities Specified bonds issued by SPEs in Japan JPY (¥) | Mar. 31, 2011 Available-for-sale securities Specified bonds issued by SPEs in Japan USD ($) | Mar. 31, 2010 Available-for-sale securities Specified bonds issued by SPEs in Japan JPY (¥) | Mar. 31, 2009 Available-for-sale securities Specified bonds issued by SPEs in Japan JPY (¥) | Mar. 31, 2011 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities USD ($) | Mar. 31, 2010 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities JPY (¥) | Mar. 31, 2009 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities JPY (¥) | Mar. 31, 2010 Certain investment in affiliates JPY (¥) | Mar. 31, 2009 Certain investment in affiliates JPY (¥) | Mar. 31, 2011 Derivative assets and liabilities (net) USD ($) | Mar. 31, 2011 Derivative assets and liabilities (net) JPY (¥) | Mar. 31, 2010 Derivative assets and liabilities (net) JPY (¥) | Mar. 31, 2009 Derivative assets and liabilities (net) JPY (¥) | Mar. 31, 2010 Derivative assets and liabilities (net) Options held/written, Caps held JPY (¥) | Mar. 31, 2009 Derivative assets and liabilities (net) Options held/written, Caps held JPY (¥) | Mar. 31, 2011 Derivative assets and liabilities (net) Credit derivatives held/written JPY (¥) | Mar. 31, 2011 Derivative assets and liabilities (net) Credit derivatives held/written USD ($) | Mar. 31, 2010 Derivative assets and liabilities (net) Credit derivatives held/written JPY (¥) | Mar. 31, 2009 Derivative assets and liabilities (net) Credit derivatives held/written JPY (¥) | Mar. 31, 2011 Derivative assets and liabilities (net) Options Held (Written), Caps Held and Other USD ($) | Mar. 31, 2011 Derivative assets and liabilities (net) Options Held (Written), Caps Held and Other JPY (¥)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | $ 1 |  | ¥ 53 |  | ¥ 166 |  | ¥ 0 |  | $ 4,832 |  | ¥ 401,804 |  | ¥ 447,859 |  | ¥ 437,939 |  | ¥ 6,841 |  | $ 82 |  | ¥ 10,176 |  | ¥ 12,969 |  | ¥ 246,305 |  | $ 2,962 |  | ¥ 300,765 |  | ¥ 341,720 |  | ¥ 148,658 |  | $ 1,788 |  | ¥ 136,918 |  | ¥ 83,250 |  | ¥ 6,954 |  | ¥ 0 |  | $ 6 |  | ¥ 493 |  | ¥ 668 |  | ¥ 0 |  | ¥ 438 |  | ¥ 0 |  | ¥ 493 |  | $ 6 |  | ¥ 230 |  | ¥ 0 |  | $ 0 |  | ¥ 0 |
Gains or losses (realized/ unrealized), included in earnings | (1) | [1] | (26) | [1] | 0 |  | (734) | [1] | (75) | [1] | (6,242) | [1] | (9,394) |  | (2,305) | [1] | (34) | [1] | 0 | [1] | (1,302) |  | (1,663) | [1] | (5,195) | [1] | (63) | [1] | (989) |  | (104) | [1] | (1,013) | [1] | (12) | [1] | (7,103) |  | (538) | [1] | (6,954) |  | 954 | [1] | (3) | [1] | (206) | [1] | (175) |  | 668 | [1] | (438) |  | 438 | [1] | (681) | [1] | (8) | [1] | 263 |  | 230 | [1] | 5 | [1] | 475 | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income | 0 |  | (2) |  | (170) |  | (86) |  | (39) |  | (3,248) |  | (519) |  | (3,438) |  | (83) |  | (1) |  | 492 |  | 251 |  | 351 |  | 4 |  | (1,910) |  | (2,273) |  | (3,516) |  | (42) |  | 899 |  | (1,416) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Gains or losses (realized/ unrealized), total | (1) |  | (28) |  | (170) |  | (820) |  | (114) |  | (9,490) |  | (9,913) |  | (5,743) |  | (117) |  | (1) |  | (810) |  | (1,412) |  | (4,844) |  | (59) |  | (2,899) |  | (2,377) |  | (4,529) |  | (54) |  | (6,204) |  | (1,954) |  | (6,954) |  | 954 |  | (3) |  | (206) |  | (175) |  | 668 |  | (438) |  | 438 |  | (681) |  | (8) |  | 263 |  | 230 |  | 5 |  | 475 |
Purchase, sales, and settlements (net) | 0 |  | (25) |  | 57 |  | 154 |  | (397) |  | (33,102) |  | (36,997) |  | (51,090) |  | (2,094) |  | (25) |  | (3,380) |  | (3,251) |  | (27,076) |  | (325) |  | (51,561) |  | (38,578) |  | (3,932) |  | (47) |  | 17,944 |  | (9,261) |  | 0 |  | 6,000 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Transfers in and/or out of Level 3 (net) | 0 | [2] | 0 | [2] | 0 | [2] | 832 | [2] | (524) | [2] | (43,536) | [2] | 855 | [2] | 66,753 | [2] | (2,057) | [2] | (25) | [2] | 855 | [2] | 1,870 | [2] | 7,929 | [2] | 96 | [2] | 0 | [2] | 0 | [2] | (49,408) | [2] | (595) | [2] | 0 | [2] | 64,883 | [2] | 0 | [2] | 0 | [2] | 32 | [2] | 2,659 | [2] | 0 | [2] | 0 | [2] | 0 | [2] | 0 | [2] | 0 | [2] | 0 | [2] | 0 | [2] | 0 | [2] | 32 | [2] | 2,659 | [2]
Ending Balance | 0 |  | 0 |  | 53 |  | 166 |  | 3,797 |  | 315,676 |  | 401,804 |  | 447,859 |  | 2,573 |  | 31 |  | 6,841 |  | 10,176 |  | 222,314 |  | 2,674 |  | 246,305 |  | 300,765 |  | 90,789 |  | 1,092 |  | 148,658 |  | 136,918 |  | 0 |  | 6,954 |  | 35 |  | 2,946 |  | 493 |  | 668 |  | 0 |  | 438 |  | (188) |  | (2) |  | 493 |  | 230 |  | 37 |  | 3,134 |
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 |  | ¥ (734) | [1] | $ (70) | [1] | ¥ (5,848) | [1] | ¥ (8,691) |  | ¥ (4,323) | [1] | ¥ (72) | [1] | $ (1) | [1] | ¥ (801) |  | ¥ (1,565) | [1] | ¥ (5,275) | [1] | $ (63) | [1] | ¥ (515) |  | ¥ (185) | [1] | ¥ (501) | [1] | $ (6) | [1] | ¥ (7,375) |  | ¥ (2,573) | [1] | ¥ 0 |  | ¥ 954 | [1] | $ (3) | [1] | ¥ (206) | [1] | ¥ (175) |  | ¥ 668 | [1] | ¥ (438) |  | ¥ 438 | [1] | ¥ (681) | [1] | $ (8) | [1] | ¥ 263 |  | ¥ 230 | [1] | $ 5 | [1] | ¥ 475 | [1]
[1] | Principally, gains and losses from trading securities are included in "brokerage commissions and net gains (losses) on investment securities"; available-for-sale securities are included in "write-downs of securities" or "life insurance premiums and related investment income"; investments in affiliates are included in "equity in net income (loss) of affiliates" and derivative assets and liabilities (net) are included in "other operating revenues /expenses", respectively.
[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.

X
- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liabilities, Change in Unrealized Gains and (Losses) Related to Instruments Held + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Total Gains Losses Realized Unrealized + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) + Details
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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) + Details
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- Definition This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(2) + Details
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- Definition This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(3) + Details
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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c + Details
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