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Fair Value of Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Short-term Debt [Line Items]
Underlying risk	interest rate risk
Notional amount	$ 500
Type of instrument	interest rate swaps
Hedge designation	fair value hedges
Amount of hedged item	500
Description of hedged item	$500 million senior notes due 2013 with a fixed interest rate of 6.625%
Basis spread on Variable rate	4.377%
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Interest Rate Fair Value Hedge Asset	3.4
Senior Notes due 2013
Short-term Debt [Line Items]
ST Debt Instrument, Face Amount	500
ST Debt Instrument, Maturity Date	Aug. 15, 2013
Fair Value of Debt Instrument	512
Convertible Notes
Short-term Debt [Line Items]
ST Debt Instrument, Face Amount	12
ST Debt Instrument, Maturity Date	Jan. 15, 2034
Fair Value of Debt Instrument	12
Senior notes due 2017
Debt Instrument [Line Items]
Face Value of Debt Instrument	400
Maturity Date	Nov. 15, 2017
Long-term Debt, Fair Value	403
Senior Notes due 2019
Debt Instrument [Line Items]
Face Value of Debt Instrument	500
Maturity Date	Aug. 15, 2019
Long-term Debt, Fair Value	604
Senior notes due 2022
Debt Instrument [Line Items]
Face Value of Debt Instrument	500
Maturity Date	Nov. 15, 2022
Long-term Debt, Fair Value	$ 498

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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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

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

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-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

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- Definition

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

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-Publisher SEC

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- Definition

Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

+ References

No definition available.

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- Definition

The average percentage points added to the reference rate to compute the variable rate on the group of interest rate derivatives.

+ References

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- Definition

Description of the hedged item related to the derivative. Includes the type of instrument hedged, contract amount, term, and so forth.

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- Definition

The hedge designation, if any, elected for the derivative.

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- Definition

Description of the type of derivative instrument, such as a swap, forward, and option. Excludes the underlying risk of the instrument.

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-Name Accounting Standards Codification

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- Definition

Description of the primary underlying risk exposure associated with the derivative. For example, interest rate risk, credit risk, foreign exchange rate risk, or overall price risk.

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- Definition

Fair value as of the balance sheet date of all derivative assets designated as interest rate fair value hedging instruments.

+ References

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

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-Name Accounting Standards Codification

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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