Marketable Securities and Securities Investments (Details) (JPY ¥) In Millions	Mar. 31, 2011	Mar. 31, 2010
Held-to-maturity Securities:
Held-to-maturity Securities, Cost	¥ 3,000,933	¥ 2,354,719
Held-to-maturity Securities, Gross unrealized gains	22,809	3,832
Held-to-maturity Securities, Gross unrealized losses	(48,221)	(31,068)
Held-to-maturity Securities, Fair value	2,975,521	2,327,483
Debt Securities [Member]
Available-for-sale:
Available-for-sale securities, Cost	1,820,673	1,945,173
Available-for-sale securities, Gross unrealized gain	30,708	39,267
Available-for-sale securities, Gross unrealized losses	(16,960)	(10,123)
Available-for-sale, Debt securities, Fair value	1,834,421	1,974,317
Japanese National Government Bonds [Member]
Available-for-sale:
Available-for-sale securities, Cost	1,124,704	1,264,725
Available-for-sale securities, Gross unrealized gain	24,032	29,496
Available-for-sale securities, Gross unrealized losses	(4,971)	(3,397)
Available-for-sale, Debt securities, Fair value	1,143,765	1,290,824
Held-to-maturity Securities:
Held-to-maturity Securities, Cost	2,902,342	2,248,230
Held-to-maturity Securities, Gross unrealized gains	22,420	3,318
Held-to-maturity Securities, Gross unrealized losses	(48,149)	(30,740)
Held-to-maturity Securities, Fair value	2,876,613	2,220,808
Available-for sale securities, Debt securities, Japanese local government bonds [Member]
Available-for-sale:
Available-for-sale securities, Cost	22,845	27,750
Available-for-sale securities, Gross unrealized gain	184	1,097
Available-for-sale securities, Gross unrealized losses	(64)	(5)
Available-for-sale, Debt securities, Fair value	22,965	28,842
Held-to-maturity Securities:
Held-to-maturity Securities, Cost	18,912	23,617
Held-to-maturity Securities, Gross unrealized gains	218	346
Held-to-maturity Securities, Gross unrealized losses	(2)	0
Held-to-maturity Securities, Fair value	19,128	23,963
Available-for sale securities, Debt securities, Japanese corporate bonds [Member]
Available-for-sale:
Available-for-sale securities, Cost	332,567	360,554
Available-for-sale securities, Gross unrealized gain	1,511	3,773
Available-for-sale securities, Gross unrealized losses	(440)	(106)
Available-for-sale, Debt securities, Fair value	333,638	364,221
Held-to-maturity Securities:
Held-to-maturity Securities, Cost	32,349	32,041
Held-to-maturity Securities, Gross unrealized gains	158	150
Held-to-maturity Securities, Gross unrealized losses	(67)	(321)
Held-to-maturity Securities, Fair value	32,440	31,870
Available-for sale securities, Debt securities, Foreign corporate bonds [Member]
Available-for-sale:
Available-for-sale securities, Cost	332,616	281,003
Available-for-sale securities, Gross unrealized gain	4,872	4,818
Available-for-sale securities, Gross unrealized losses	(11,368)	(6,492)
Available-for-sale, Debt securities, Fair value	326,120	279,329
Held-to-maturity Securities:
Held-to-maturity Securities, Cost	47,330	50,831
Held-to-maturity Securities, Gross unrealized gains	13	18
Held-to-maturity Securities, Gross unrealized losses	(3)	(7)
Held-to-maturity Securities, Fair value	47,340	50,842
Available-for sale securities, Debt securities, Other [Member]
Available-for-sale:
Available-for-sale securities, Cost	7,941	11,141
Available-for-sale securities, Gross unrealized gain	109	83
Available-for-sale securities, Gross unrealized losses	(117)	(123)
Available-for-sale, Debt securities, Fair value	7,933	11,101
Available-for-sale securities and held-to-maturity securities [Member]
Held-to-maturity Securities:
Securities, Cost, Total	4,906,023	4,399,645
Securities, Gross unrealized gains, Total	122,590	117,529
Securities, Gross unrealized losses, Total	(68,628)	(44,628)
Securities, Fair value, Total	4,959,985	4,472,546
Equity Securities [Member]
Available-for-sale:
Available-for-sale securities, Cost	84,417	99,753
Available-for-sale securities, Gross unrealized gain	69,073	74,430
Available-for-sale securities, Gross unrealized losses	(3,447)	(3,437)
Available-for-sale, Equity securities, Fair value	¥ 150,043	¥ 170,746

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

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As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.

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Marketable Securities Amortized Cost.

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Marketable Securities Gross Unrealized Gains.

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Marketable Securities Gross Unrealized Losses.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 7
-Footnote 2

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 19

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For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading. Such securities are reported at fair value; unrealized gains and losses of such securities are excluded from earnings and included in other comprehensive income, a separate component of shareholders' equity, unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13, 137

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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For an unclassified balance sheet, this item represents equity securities categorized neither as held-to-maturity nor trading. Equity securities represent ownership interests or the right to acquire ownership interests in corporations and other legal entities which ownership interest is represented by shares of common or preferred stock (which is not mandatorily redeemable or redeemable at the option of the holder), convertible securities, stock rights, or stock warrants. Unrealized gains and losses related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 22

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 19

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 86-40

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Publisher FASB
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 3
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For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity; such investments are measured at amortized cost (carrying value). The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 3
-Section A
-Paragraph 4, 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 17

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 19

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