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Changes in Components of Accumulated Other Comprehensive Income (Loss) (Detail) In Millions	12 Months Ended
	Mar. 31, 2011 USD ($)	Mar. 31, 2011 JPY (¥)	Mar. 31, 2010 JPY (¥)	Mar. 31, 2009 JPY (¥)	Mar. 31, 2011 Accumulated Net Unrealized Investment Gain (Loss) USD ($)	Mar. 31, 2011 Accumulated Net Unrealized Investment Gain (Loss) JPY (¥)	Mar. 31, 2010 Accumulated Net Unrealized Investment Gain (Loss) JPY (¥)	Mar. 31, 2009 Accumulated Net Unrealized Investment Gain (Loss) JPY (¥)	Mar. 31, 2011 Accumulated Defined Benefit Plans Adjustment USD ($)	Mar. 31, 2011 Accumulated Defined Benefit Plans Adjustment JPY (¥)	Mar. 31, 2010 Accumulated Defined Benefit Plans Adjustment JPY (¥)	Mar. 31, 2009 Accumulated Defined Benefit Plans Adjustment JPY (¥)	Mar. 31, 2011 Accumulated Translation Adjustment USD ($)	Mar. 31, 2011 Accumulated Translation Adjustment JPY (¥)	Mar. 31, 2010 Accumulated Translation Adjustment JPY (¥)	Mar. 31, 2009 Accumulated Translation Adjustment JPY (¥)	Mar. 31, 2011 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges USD ($)	Mar. 31, 2011 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges JPY (¥)	Mar. 31, 2010 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges JPY (¥)	Mar. 31, 2009 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges JPY (¥)
Beginning Balance	$ (956)	¥ (79,459)	¥ (92,384)	¥ (19,295)	$ 90	¥ 7,495	¥ (5,615)	¥ 36,286	$ (110)	¥ (9,092)	¥ (16,221)	¥ (4,123)	$ (934)	¥ (77,651)	¥ (71,791)	¥ (53,802)	$ (2)	¥ (211)	¥ 1,243	¥ 2,344
Cumulative effect of applying new accounting standards for the consolidation of variable interest entities, net of tax of ¥2,265 million or $27 million in 2011	(41)	(3,406)			(43)	(3,597)							2	191
Beginning Balance Restated	(997)	(82,865)			47	3,898			(110)	(9,092)			(932)	(77,460)			(2)	(211)
Net unrealized gains (losses) on investment in securities, net of tax of ¥(2,379) or $(29) million in 2011, ¥ (6,610) million in 2010 and ¥ 30,939 million in 2009	39	3,292	11,357	(48,225)	39	3,292	11,357	(48,225)
Reclassification adjustment included in net income, net of tax of ¥(3,289) or $(39) million in 2011, ¥(1,206) million in 2010, and ¥ (3,406) million in 2009	52	4,313	1,753	6,324	52	4,313	1,753	6,324
Defined benefit pension plans, net of tax of ¥1,339 or $16 million in 2011, ¥(4,567) million in 2010, and ¥8,169 million in 2009	(23)	(1,934)	6,601	(11,804)					(23)	(1,934)	6,601	(11,804)
Reclassification adjustment included in net income, net of tax of ¥88 or $1 million in 2011, ¥(358) million in 2010, ¥193 million in 2009	(1)	(72)	528	(294)					(1)	(72)	528	(294)
Foreign currency translation adjustments, net of tax of ¥245 or $3 million in 2011, ¥ (4,487) million in 2010, and ¥2,309 million in 2009	(218)	(18,158)	(6,199)	(18,275)									(218)	(18,158)	(6,199)	(18,275)
Reclassification adjustment included in net income, net of tax of ¥(31) or $0 million in 2011, ¥(235) million in 2010 and ¥(198) million in 2009	1	44	339	286									1	44	339	286
Net unrealized gains (losses) on derivative instruments, net of tax of ¥488 or $6 million in 2011, ¥743 million in 2010, and ¥274 million in 2009	(12)	(1,011)	(630)	(944)													(12)	(1,011)	(630)	(944)
Reclassification adjustment included in net income, net of tax of ¥(150) or $(2) million in 2011, ¥323 million in 2010, and ¥116 million in 2009	2	211	(824)	(157)													2	211	(824)	(157)
Change during year	(160)	(13,315)	12,925	(73,089)	91	7,605	13,110	(41,901)	(24)	(2,006)	7,129	(12,098)	(217)	(18,114)	(5,860)	(17,989)	(10)	(800)	(1,454)	(1,101)
Ending Balance	$ (1,157)	¥ (96,180)	¥ (79,459)	¥ (92,384)	$ 138	¥ 11,503	¥ 7,495	¥ (5,615)	$ (134)	¥ (11,098)	¥ (9,092)	¥ (16,221)	$ (1,149)	¥ (95,574)	¥ (77,651)	¥ (71,791)	$ (12)	¥ (1,011)	¥ (211)	¥ 1,243

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- Definition

Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Restated

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Other Comprehensive Income, Defined Benefit Plans Net Unamortized (Gain) Loss Arising During Period, Net of Tax, Attributable to Parent

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Other Comprehensive Income, Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax, Attributable to Parent

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Other Comprehensive Income, Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax, Attributable to Parent

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Other Comprehensive Income, Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax, Attributable to Parent

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Appreciation or loss in value (before reclassification adjustment) of the total of unsold securities during the period being reported on, net of tax, attributable to the parent entity. Reclassification adjustments include: (1) the unrealized holding gain or loss, net of tax, at the date of the transfer for a debt security from the held-to-maturity category transferred into the available-for-sale category. Also includes the unrealized gain or loss at the date of transfer for a debt security from the available-for-sale category transferred into the held-to-maturity category; (2) the unrealized gains or losses realized upon the sale of securities, after tax; and (3) the unrealized gains or losses realized upon the write-down of securities, after tax.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at fiscal year-end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, and unrealized gains and losses on certain investments in debt and equity securities as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 26

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 31
-Article 5

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The after tax effect on other comprehensive income of a change in accounting principle recognized in the period, which occurred before retrospective adjustments were required, or is in lieu of retrospective adjustments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 154
-Paragraph 9, 17

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This element represents Other Comprehensive Income (Loss), Net of Tax, for the period attributable to the parent entity. Includes deferred gains (losses) on qualifying hedges, unrealized holding gains (losses) on available-for-sale securities, minimum pension liability, and cumulative translation adjustment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29, 30

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