Financing Arrangement (Convertible Note Hedge and Warrants Issuance) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended
Jul. 31, 2011	Jul. 14, 2011
Convertible Note Hedge [Member]
Financing Arrangement [Line Items]
Shares covered by warrants issuance		19.9
Amount paid for Convertible Note Hedge	$ 107
Warrant [Member]
Financing Arrangement [Line Items]
Shares covered by warrants issuance		19.9
Strike price of warrants		41.14
Proceeds from Warrants transaction	$ 65
Convertible Debt
Financing Arrangement [Line Items]
Debt Instrument, Convertible, Conversion Price		31.74

Cost of hedge net of proceeds from warrants.

No definition available.

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- Definition

Shares Covered By Convertible Note Hedge

+ References

No definition available.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(2))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Subparagraph 2

-Article 4

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

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- Definition

The cash outflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 27

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3581-108585

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