Stockholders' equity (Details) (JPY ¥) In Millions, except Share data	12 Months Ended
Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
Changes in the number of shares of common stock issued and outstanding
Common stock, shares issued, beginning balance	1,004,571,464	1,004,535,364	1,004,443,364
Exercise of stock acquisition rights	65,200	36,100	92,000
Common stock, shares issued, ending balance	1,004,636,664	1,004,571,464	1,004,535,364
Unrealized gains (losses) on securities, net -
Unrealized holding gains (losses) arising during the period, Pre-tax	¥ (42,311)	¥ 74,501	¥ (105,145)
Unrealized holding gains (losses) arising during the period, Tax	12,996	(22,469)	40,198
Unrealized holding gains (losses) arising during the period, Net-of-tax	(25,445)	33,502	(48,207)
Less : Reclassification adjustment included in net income, Pre-tax	21,548	(1,896)	11,306
Less : Reclassification adjustment included in net income, Tax	(8,104)	661	(3,958)
Less : Reclassification adjustment included in net income, Net-of-tax	13,444	(1,235)	7,348
Unrealized gains (losses) on derivative instruments, net -
Unrealized holding gains (losses) arising during the period, Pre-tax	(662)	2,040	(2,988)
Unrealized holding gains (losses) arising during the period, Tax	52	(415)	1,059
Unrealized holding gains (losses) arising during the period, Net-of-tax	(610)	1,625	(1,929)
Less : Reclassification adjustment included in net income, Pre-tax	(785)	(566)	5,335
Less : Reclassification adjustment included in net income, Tax	(158)	489	(1,619)
Less : Reclassification adjustment included in net income, Net-of-tax	(943)	(77)	3,716
Pension liability adjustment, Pre-tax	3,164	45,767	(127,222)
Pension liability adjustment, Tax	(6,463)	(22,074)	51,527
Pension liability adjustment, Net-of-tax	(3,176)	23,720	(74,517)
Foreign currency translation adjustments -
Translation adjustments arising during the period, Pre-tax	(118,840)	4,583	(250,085)
Translation adjustments arising during the period, Tax	1,256	(22)	1,854
Translation adjustments arising during the period, Net-of-tax	(117,584)	4,561	(248,231)
Less : Reclassification adjustment included in net income, Pre-tax	(832)	2,289	534
Less : Reclassification adjustment included in net income, Tax	0	0	0
Less : Reclassification adjustment included in net income, Net-of-tax	(832)	2,289	534
Other comprehensive income (loss), Pre-tax	(138,718)	126,718	(468,265)
Other comprehensive income (loss), Tax	(421)	(43,830)	89,061
Other comprehensive income (loss), Net-of-tax	¥ (135,146)	¥ 64,385	¥ (361,286)

Changes in the number of shares of common stock issued and outstanding.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Amounts recognized in other comprehensive income (but not yet recognized in net periodic benefit cost), including the net gain (loss) and net prior service cost (credit) arising during the period. Also includes reclassification adjustments out of other comprehensive income as a result of being recognized as components of net periodic benefit cost for the period.

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Net changes to accumulated comprehensive income during the period related to benefit plans, after tax.

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Tax effects of the net changes to accumulated comprehensive income during the period related to benefit plans.

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Change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity for the period being reported, net of tax. If an entity's functional currency is a foreign currency, translation adjustments result from the process of translating that entity's financial statements into the reporting currency. Includes gain (loss) on foreign currency forward exchange contracts. Includes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. Includes the gain or loss on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain or loss under FAS 52 and that have been designated and have qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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Pre tax change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity for the period being reported. If an entity's functional currency is a foreign currency, translation adjustments result from the process of translating that entity's financial statements into the reporting currency. Includes gain (loss) on foreign currency forward exchange contracts. Includes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. Includes the gain or loss on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain or loss under FAS 52 and that have been designated and have qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation. Does not include the effect of taxes.

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Pre tax reclassification adjustment for translation gains or losses realized upon the sale or complete or substantially complete liquidation of an investment in a foreign entity. Includes also reclassification adjustments on foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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Reclassification adjustment for translation gains or losses realized upon the sale or complete or substantially complete liquidation of an investment in foreign entity, after tax.

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Tax effect on the change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity for the period being reported.

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Tax effect on reclassification adjustment for translation gains or losses realized upon the sale or complete or substantially complete liquidation of an investment in foreign entity.

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This element represents Other Comprehensive Income (Loss), Before Tax, for the period. The pretax revenues, expenses, gains, and losses that under generally accepted accounting principles are included in comprehensive income, but excluded from net income. Includes the entity's proportionate share of an investee's equity adjustments for other comprehensive income.

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

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Tax effect of the change in accumulated other comprehensive income, that is, the tax effect on items included in other comprehensive income during the period.

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Pre tax reclassification adjustment for gains or losses realized upon the sale of securities.

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Reclassification adjustment for unrealized gains or losses realized upon the sale of securities, after tax.

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Tax effect on the reclassification adjustment for gains or losses realized upon the sale of securities during the period.

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Pre tax reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk.

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Net of tax effect of the reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

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Pre tax change in accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk. Includes an entity's share of an equity investee's increase (decrease) in deferred hedging gains or losses.

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Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's increase (decrease) in deferred hedging gains or losses.

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Gross appreciation or the gross loss in value of the total of unsold available-for-sale securities during the period being reported (except when designated as a fair value hedge).

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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. 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17, 22

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13

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

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-Subparagraph b

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.

+ References

+ Details

Name:	us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of shares issued during the period as a result of the exercise of stock options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration