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The Effect of Derivative Instruments on the Consolidated Statements of Income, Pre-tax (Detail) In Millions	12 Months Ended
	Mar. 31, 2011 Cash flow hedges Interest rate swap agreements USD ($)	Mar. 31, 2011 Cash flow hedges Interest rate swap agreements JPY (¥)	Mar. 31, 2010 Cash flow hedges Interest rate swap agreements JPY (¥)	Mar. 31, 2009 Cash flow hedges Interest rate swap agreements JPY (¥)	Mar. 31, 2011 Cash flow hedges Interest rate swap agreements Interest on loans and investment securities/Interest expense USD ($)	Mar. 31, 2011 Cash flow hedges Interest rate swap agreements Interest on loans and investment securities/Interest expense JPY (¥)	Mar. 31, 2010 Cash flow hedges Interest rate swap agreements Interest on loans and investment securities/Interest expense JPY (¥)	Mar. 31, 2009 Cash flow hedges Interest rate swap agreements Interest on loans and investment securities/Interest expense JPY (¥)	Mar. 31, 2011 Cash flow hedges Foreign exchange contracts USD ($)	Mar. 31, 2011 Cash flow hedges Foreign exchange contracts JPY (¥)	Mar. 31, 2010 Cash flow hedges Foreign exchange contracts JPY (¥)	Mar. 31, 2009 Cash flow hedges Foreign exchange contracts JPY (¥)	Mar. 31, 2011 Cash flow hedges Foreign exchange contracts Foreign currency transaction loss USD ($)	Mar. 31, 2011 Cash flow hedges Foreign exchange contracts Foreign currency transaction loss JPY (¥)	Mar. 31, 2010 Cash flow hedges Foreign exchange contracts Foreign currency transaction loss JPY (¥)	Mar. 31, 2009 Cash flow hedges Foreign exchange contracts Foreign currency transaction loss JPY (¥)	Mar. 31, 2011 Cash flow hedges Foreign currency swap agreements USD ($)	Mar. 31, 2011 Cash flow hedges Foreign currency swap agreements JPY (¥)	Mar. 31, 2010 Cash flow hedges Foreign currency swap agreements JPY (¥)	Mar. 31, 2009 Cash flow hedges Foreign currency swap agreements JPY (¥)	Mar. 31, 2011 Cash flow hedges Foreign currency swap agreements Interest on loans and investment securities/Interest expense/Foreign currency transaction loss USD ($)	Mar. 31, 2011 Cash flow hedges Foreign currency swap agreements Interest on loans and investment securities/Interest expense/Foreign currency transaction loss JPY (¥)	Mar. 31, 2010 Cash flow hedges Foreign currency swap agreements Interest on loans and investment securities/Interest expense/Foreign currency transaction loss JPY (¥)	Mar. 31, 2009 Cash flow hedges Foreign currency swap agreements Interest on loans and investment securities/Interest expense/Foreign currency transaction loss JPY (¥)	Mar. 31, 2009 Cash flow hedges Foreign currency swap agreements Other operating revenues/expenses JPY (¥)	Mar. 31, 2011 Fair value hedges Interest rate swap agreements Interest on loans and investment securities/Interest expense USD ($)	Mar. 31, 2011 Fair value hedges Interest rate swap agreements Interest on loans and investment securities/Interest expense JPY (¥)	Mar. 31, 2010 Fair value hedges Interest rate swap agreements Interest on loans and investment securities/Interest expense JPY (¥)	Mar. 31, 2009 Fair value hedges Interest rate swap agreements Interest on loans and investment securities/Interest expense JPY (¥)	Mar. 31, 2011 Fair value hedges Foreign exchange contracts Foreign currency transaction loss USD ($)	Mar. 31, 2011 Fair value hedges Foreign exchange contracts Foreign currency transaction loss JPY (¥)	Mar. 31, 2010 Fair value hedges Foreign exchange contracts Foreign currency transaction loss JPY (¥)	Mar. 31, 2009 Fair value hedges Foreign exchange contracts Foreign currency transaction loss JPY (¥)	Mar. 31, 2011 Fair value hedges Foreign currency swap agreements Foreign currency transaction loss USD ($)	Mar. 31, 2011 Fair value hedges Foreign currency swap agreements Foreign currency transaction loss JPY (¥)	Mar. 31, 2010 Fair value hedges Foreign currency swap agreements Foreign currency transaction loss JPY (¥)	Mar. 31, 2009 Fair value hedges Foreign currency swap agreements Foreign currency transaction loss JPY (¥)	Mar. 31, 2011 Fair value hedges Foreign currency long-term-debt Foreign currency transaction loss USD ($)	Mar. 31, 2011 Fair value hedges Foreign currency long-term-debt Foreign currency transaction loss JPY (¥)	Mar. 31, 2011 Hedges of net investment in foreign operations Foreign exchange contracts USD ($)	Mar. 31, 2011 Hedges of net investment in foreign operations Foreign exchange contracts JPY (¥)	Mar. 31, 2010 Hedges of net investment in foreign operations Foreign exchange contracts JPY (¥)	Mar. 31, 2009 Hedges of net investment in foreign operations Foreign exchange contracts JPY (¥)	Mar. 31, 2009 Hedges of net investment in foreign operations Foreign exchange contracts Brokerage commissions and net gains (losses) on investment securities JPY (¥)	Mar. 31, 2011 Hedges of net investment in foreign operations Foreign exchange contracts Gains (losses) on sales of subsidiaries and affiliates and liquidation losses, net USD ($)	Mar. 31, 2011 Hedges of net investment in foreign operations Foreign exchange contracts Gains (losses) on sales of subsidiaries and affiliates and liquidation losses, net JPY (¥)	Mar. 31, 2010 Hedges of net investment in foreign operations Foreign exchange contracts Gains (losses) on sales of subsidiaries and affiliates and liquidation losses, net JPY (¥)	Mar. 31, 2011 Hedges of net investment in foreign operations Borrowings and bonds in local currency USD ($)	Mar. 31, 2011 Hedges of net investment in foreign operations Borrowings and bonds in local currency JPY (¥)	Mar. 31, 2010 Hedges of net investment in foreign operations Borrowings and bonds in local currency JPY (¥)	Mar. 31, 2009 Hedges of net investment in foreign operations Borrowings and bonds in local currency JPY (¥)	Mar. 31, 2011 Trading derivatives or derivatives not designated as hedging instruments Interest rate swap agreements Other operating revenues/expenses USD ($)	Mar. 31, 2011 Trading derivatives or derivatives not designated as hedging instruments Interest rate swap agreements Other operating revenues/expenses JPY (¥)	Mar. 31, 2010 Trading derivatives or derivatives not designated as hedging instruments Interest rate swap agreements Other operating revenues/expenses JPY (¥)	Mar. 31, 2009 Trading derivatives or derivatives not designated as hedging instruments Interest rate swap agreements Other operating revenues/expenses JPY (¥)	Mar. 31, 2011 Trading derivatives or derivatives not designated as hedging instruments Foreign exchange contracts Brokerage commissions and net gains (losses) on investment securities USD ($)	Mar. 31, 2011 Trading derivatives or derivatives not designated as hedging instruments Foreign exchange contracts Brokerage commissions and net gains (losses) on investment securities JPY (¥)	Mar. 31, 2010 Trading derivatives or derivatives not designated as hedging instruments Foreign exchange contracts Brokerage commissions and net gains (losses) on investment securities JPY (¥)	Mar. 31, 2009 Trading derivatives or derivatives not designated as hedging instruments Foreign exchange contracts Brokerage commissions and net gains (losses) on investment securities JPY (¥)	Mar. 31, 2011 Trading derivatives or derivatives not designated as hedging instruments Foreign currency swap agreements Other operating revenues/expenses USD ($)	Mar. 31, 2011 Trading derivatives or derivatives not designated as hedging instruments Foreign currency swap agreements Other operating revenues/expenses JPY (¥)	Mar. 31, 2010 Trading derivatives or derivatives not designated as hedging instruments Foreign currency swap agreements Other operating revenues/expenses JPY (¥)	Mar. 31, 2009 Trading derivatives or derivatives not designated as hedging instruments Foreign currency swap agreements Other operating revenues/expenses JPY (¥)	Mar. 31, 2011 Trading derivatives or derivatives not designated as hedging instruments Future Brokerage commissions and net gains (losses) on investment securities USD ($)	Mar. 31, 2011 Trading derivatives or derivatives not designated as hedging instruments Future Brokerage commissions and net gains (losses) on investment securities JPY (¥)	Mar. 31, 2010 Trading derivatives or derivatives not designated as hedging instruments Future Brokerage commissions and net gains (losses) on investment securities JPY (¥)	Mar. 31, 2009 Trading derivatives or derivatives not designated as hedging instruments Future Brokerage commissions and net gains (losses) on investment securities JPY (¥)	Mar. 31, 2011 Trading derivatives or derivatives not designated as hedging instruments Credit derivatives held/written Other operating revenues/expenses USD ($)	Mar. 31, 2011 Trading derivatives or derivatives not designated as hedging instruments Credit derivatives held/written Other operating revenues/expenses JPY (¥)	Mar. 31, 2010 Trading derivatives or derivatives not designated as hedging instruments Credit derivatives held/written Other operating revenues/expenses JPY (¥)	Mar. 31, 2009 Trading derivatives or derivatives not designated as hedging instruments Credit derivatives held/written Other operating revenues/expenses JPY (¥)	Mar. 31, 2010 Trading derivatives or derivatives not designated as hedging instruments Options held/written, Caps held Other operating revenues/expenses JPY (¥)	Mar. 31, 2009 Trading derivatives or derivatives not designated as hedging instruments Options held/written, Caps held Other operating revenues/expenses JPY (¥)	Mar. 31, 2011 Trading derivatives or derivatives not designated as hedging instruments Options Held (Written), Caps Held and Other Other operating revenues/expenses USD ($)	Mar. 31, 2011 Trading derivatives or derivatives not designated as hedging instruments Options Held (Written), Caps Held and Other Other operating revenues/expenses JPY (¥)
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other comprehensive income on derivative (effective portion)	$ 7	¥ 598	¥ 1,070	¥ (2,367)					$ 6	¥ 526	¥ (28)	¥ 193					$ (32)	¥ (2,623)	¥ (2,415)	¥ 956																				$ 54	¥ 4,468	¥ (45)	¥ 6,618					$ 45	¥ 3,711	¥ 1,783	¥ 1,393
Gains (losses) reclassified from accumulated other comprehensive income (loss) into income (effective portion)					(4)	(313)	(89)	170					3	291	(28)	1					5	383	1,264	102																				2	0	39	820	0	0	0	0
Gains (losses) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing)					0	0	0	0					0	0	0	0					0	0	0		3																			0	0	0	0	0	0	0	0
Gains (losses) recognized in income on derivative																										24	1,986	924	(682)	105	8,765	4,700	4,633	52	4,297	349	1,057	14	1,193													0	34	14	40	(3)	(245)	67	293	0	(10)	998	(945)	23	1,897	(147)	3,778	(8)	(675)	383	105	(477)	445	8	660
Gains (losses) recognized in income on hedged item																										$ (27)	¥ (2,217)	¥ (1,231)	¥ 662	$ (105)	¥ (8,765)	¥ (4,700)	¥ (4,633)	$ (52)	¥ (4,297)	¥ (349)	¥ (1,057)	$ (14)	¥ (1,193)

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Hedged Items, Gain (Loss) Recognized in Income, Net

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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.

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- Definition

The income statement location of the effective portion of net gain or loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph b
-Clause 3

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph b

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The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph b

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph b
-Clause 2

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