Pension and severance plans.

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Pension and severance plans.

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Percentage of the indemnities under existing regulations to employees covered by defined benefits.

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The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph s

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7
-Subparagraph d

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The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

+ References

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The amounts in accumulated other comprehensive income related to transition assets (obligations), origination from the adoption of FAS 87 and 106, expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

+ References

+ Details

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The percentage of the fair value of debt securities to the fair value of total plan assets held as of the measurement date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph d(1)

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The percentage of the fair value of equity securities to the fair value of total plan assets held as of the measurement date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph d(1)

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The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph g

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The percentage of the fair value of investments other than debt securities, equity securities, and real estate to the fair value of total plan assets held as of the measurement date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph d(1)

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Target allocation percentage of investments in debt securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph d(2)

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Target allocation percentage of investments in equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Target allocation percentage in other than debt securities, equity securities, and real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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- Definition

Adjustment increasing (decreasing) accumulated other comprehensive income due to a change in the measurement date for a defined benefit pension and other postretirement plan in the initial application of the measurement provisions of FAS 158.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 21

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Adjustment decreasing (increasing) retained earnings due to a change in the measurement date for a defined benefit pension and other postretirement plan in the initial application of the measurement provision of FAS 158.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 21

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Pension and severance Plans (Details Textuals) (JPY ¥)	12 Months Ended
Pension and severance Plans (Details Textuals) (JPY ¥)	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
Pension and severance plans (Textuals) [Abstract]
Percentage of the indemnities under existing regulations to employees covered by defined benefits	65.00%
Adjustments of beginning retained earnings			¥ 668,000,000
Adjustments of accumulated other comprehensive income			630,000,000
Expected Amortization of Net actuarial loss from accumulated other comprehensive income in next fiscal Year	13,454,000,000
Expected Amortization of Prior service cost from accumulated other comprehensive income in next fiscal Year	10,761,000,000
Expected Amortization of Transition obligation asset from accumulated other comprehensive income in next fiscal Year	79,000,000
Commingled funds [Member] \| Japanese Plans [Member]
Additional pension and severance plans (Textuals) [Abstract]
Percentage of investments in equity securities for the pension plans	39.00%	38.00%
Percentage of investments in fixed income securities for the pension plans	58.00%	57.00%
Percentage of investments in other investments for the pension plans	3.00%	5.00%
Japanese Plans [Member]
Additional pension and severance plans (Textuals) [Abstract]
Percentage of investments in equity securities for the pension plans	28.00%
Percentage of investments in fixed income securities for the pension plans	58.00%
Percentage of investments in other investments for the pension plans	14.00%
Expected contribution in defined benefit pension plans	35,000,000,000
Foreign Plans [Member]
Additional pension and severance plans (Textuals) [Abstract]
Percentage of investments in equity securities for the pension plans	54.00%
Percentage of investments in fixed income securities for the pension plans	34.00%
Percentage of investments in other investments for the pension plans	12.00%
Expected contribution in defined benefit pension plans	11,000,000,000
Pension and severance plans (Textuals) [Abstract]
Expected Amortization of Transition obligation asset from accumulated other comprehensive income in next fiscal Year	¥ 20,000,000	¥ 67,000,000	¥ 212,000,000
Japanese equity securities [Member]
Additional pension and severance plans (Textuals) [Abstract]
Percentage of investments in equity securities for the pension plans	64.00%	62.00%
Foreign Equity securities [Member]
Additional pension and severance plans (Textuals) [Abstract]
Percentage of investments in equity securities for the pension plans	36.00%	38.00%
Japanese national and local governments [Member]
Additional pension and severance plans (Textuals) [Abstract]
Percentage of investments in fixed income securities for the pension plans	65.00%	63.00%
Foreign Government Debt Securities [Member]
Additional pension and severance plans (Textuals) [Abstract]
Percentage of investments in fixed income securities for the pension plans	35.00%	37.00%