The price per share of the conversion feature embedded in the debt instrument.

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 20

-Section 50

-Paragraph 5

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- Definition

The ratio applied to the debt for purposes of determining the number of shares of the equity security into which the debt will be converted.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 6

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-Publisher FASB

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-Glossary Conversion Rate

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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-Article 5

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-Name Accounting Standards Codification

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-Section 45

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-Name Accounting Standards Codification

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-Name Accounting Principles Board Opinion (APB)

-Number 21

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- Definition

Interest rate stated in the contractual debt agreement.

+ References

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

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

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

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- Definition

The cash outflow to pay off an obligation from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-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.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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- Definition

DenominatorOfPrincipalAmountUponWhichConversionRateIsBasedOn

+ References

No definition available.

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- Definition

Minimum required sales price as a percentage of conversion price

+ References

No definition available.

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- Definition

Percentage of maximum required trading price per convertible debentures

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Debt and interest Expense (Narrative) (Details) (USD $)	1 Months Ended
Debt and interest Expense (Narrative) (Details) (USD $)	Apr. 30, 2013	Aug. 31, 2007 Rate	Apr. 16, 2013 Rate	Aug. 15, 2007 Rate
Interest Expense [Abstract]
Debt Instrument, Face Amount			$ 750,000,000	$ 1,250,000,000
Debt Instrument, Interest Rate, Stated Percentage			4.625%	3.25%
Debt Instrument, Maturity Date	May 01, 2023	Aug. 15, 2037
Debt Instrument, Convertible, Conversion Ratio		29.0968
DenominatorOfPrincipalAmountUponWhichConversionRateIsBased				1,000
Minimum required sales price as a percentage of conversion price		130.00%
Debt Instrument, Convertible, Conversion Price				$ 34.37
Percentage of maximum required trading price per convertible debentures		98.00%
Repayments of Lines of Credit	$ 100,000,000