Income Taxes (Tax Effects of Temporary Differences That Give Rise to Deferred Tax Assets and Liabilities) (Details) (JPY ¥) In Millions	Mar. 31, 2011	Mar. 31, 2010
Income Taxes
Inventory valuation	¥ 87,647	¥ 94,596
Expenses accrued for financial statement purposes but not currently included in taxable income	171,779	154,679
Property, plant, and equipment	231,987	295,091
Retirement and severance benefits	273,830	253,636
Tax loss carryforwards	653,378	616,648
Other	181,190	237,797
Total gross deferred tax assets	1,599,811	1,652,447
Less valuation allowance	990,354	1,014,703
Net deferred tax assets	609,457	637,744
Net unrealized holding gains of available-for-sale securities	(26,130)	(42,458)
Intangible assets	(166,403)	(194,691)
Other	(82,936)	(89,242)
Total gross deferred tax liabilities	(275,469)	(326,391)
Net deferred tax assets	¥ 333,988	¥ 311,353

Deferred Tax Assets Employee Benefits And Severance Costs

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Deferred Tax Assets Property Plant And Equipment

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Deferred Tax Asset Expenses Accrued For Financials Statements Excluded From Taxable Income

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The sum of the tax effects as of the balance sheet date of the amounts of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws ( before the valuation allowance, if any, to reduce such sum amount to net realizable value). Includes any tax benefit realized in deferred tax assets for significant impacts of tax planning strategies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 289

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions attributable to inventory related items which can only be realized if sufficient taxable income is generated in future periods to enable the deduction to be taken.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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For entities that net deferred tax assets and tax liabilities, represents the unclassified net amount of deferred tax assets and liabilities as of the balance sheet date, which result from applying the applicable enacted tax rate to net temporary differences and carryforwards pertaining to assets or liabilities. A temporary difference is a difference between the tax basis of an asset or liability and its carrying amount in the financial statements prepared in accordance with generally accepted accounting principles that will reverse in ensuing periods.

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The aggregate tax effects as of the balance sheet date of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; net of deducting the allocated valuation allowance, if any, to reduce such amount to net realizable value.

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The sum of the tax effects as of the balance sheet date of the amount of excesses of tax deductions over gross income in a year which cannot be used on the tax returns in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset.

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The tax effect as of the balance sheet date of the amount of estimated future tax deductions arising from other temporary differences not otherwise specified in the taxonomy.

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The sum of the portions of deferred tax assets as of the balance sheet date for which, based on the weight of available evidence, it is more likely than not will not be realized through future reductions of tax-based income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The cumulative amount of all deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A taxable temporary difference is a difference between the tax basis and the carrying amount of an asset or liability in the financial statements prepared in accordance with generally accepted accounting principles that will result in taxable amounts in one or more future periods.

+ References

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The cumulative amount of the estimated future tax effects attributable to the difference between the tax basis of intangible assets and the basis of intangible assets computed in accordance with generally accepted accounting principles. The difference in basis, whether due to amortization or other reasons, will increase future taxable income when such difference reverses. Intangible assets include, but are not limited to, assets such as patents, trademarks and customer lists.

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The cumulative amount of the estimated future tax effects attributable to other temporary differences not otherwise specified in this taxonomy that were expensed for tax purposes but capitalized in conformity with generally accepted accounting principles, or which were recognized as revenue under GAAP but not for tax purposes, which will reverse in future periods.

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The amount as of the balance sheet date of the estimated future tax effects arising from unrealized gains on investments in debt and equity securities categorized as trading which will increase future taxable income when such gain is realized. This item excludes deferred tax liabilities generated due to unrealized holding gains on investments in debt and equity securities categorized as available for sale which unrealized holding gains are included in the item Deferred Tax Liabilities, Other Comprehensive Income; such unrealized holding gains increase the carrying value of the asset recorded for financial reporting purposes, but not for tax purposes.

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