Cross-currency interest rate swaps entered.

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- Definition

Cross-currency interest rate swaps matured.

+ Details

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- Definition

Fair Value Measurements.

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- Definition

Fixed to floating interest rate swaps entered.

+ Details

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- Definition

Number of cross-currency interest rate swaps entered.

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Number of fixed to floating interest rate swaps entered.

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- Definition

Period cross-currency interest rate swaps were renewed.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 22

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13, 19

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563

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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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13476-108611

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- Definition

Interest rate stated in the contractual debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Fair Value Measurements (Details Textuals)	3 Months Ended
Fair Value Measurements (Details Textuals)	Mar. 31, 2011 JPY (¥)	Dec. 31, 2010 JPY (¥)	Sep. 30, 2010 USD ($)	Sep. 30, 2010 JPY (¥)	Mar. 31, 2010 JPY (¥) Swap	Sep. 30, 2011 USD ($)	Mar. 31, 2011 Series One [Member] USD ($)	Mar. 31, 2010 Series One [Member] USD ($)	Mar. 31, 2011 Series Two [Member] USD ($) Swap	Mar. 31, 2010 Series Two [Member] USD ($) Swap	Mar. 31, 2011 Series Three [Member] USD ($) Swap
Fair Value Measurements (Textuals)
Fixed to floating interest rate swaps entered							$ 100,000,000	$ 100,000,000	$ 300,000,000	$ 300,000,000	$ 450,000,000
Coupon rate of notes							5.80%	5.80%	4.875%	4.875%	1.75%
Number of fixed to floating interest rate swaps entered									2	2	5
Unrealized gains on investments in marketable common stock			3,000,000			9,000,000
Unrealized losses on investments in marketable common stock						3,000,000
Number of cross-currency interest rate swaps entered					3
Cross-currency interest rate swaps entered					20,000,000,000
Cross-currency interest rate swaps matured	10,000,000,000	5,000,000,000		5,000,000,000
Period cross-currency interest rate swaps were renewed	1 year	1 year	1 year	1 year
Fair value of long term debt			$ 3,700,000,000			$ 4,900,000,000