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Fair Value (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value Inputs - Level 2 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Fair Value Inputs - Level 2 [Member]	Dec. 31, 2012 Senior Notes due 2013 [Member]	Dec. 31, 2012 Senior notes due 2017 [Member]	Dec. 31, 2012 Senior Notes due 2019 [Member]	Dec. 31, 2012 Senior notes due 2022 [Member]
Fair value debt instruments [Line Items]
Face Value of Debt Instrument				$ 500	$ 400	$ 500	$ 500
Maturity Date				Aug. 01, 2013	Nov. 15, 2017	Sep. 15, 2019	Nov. 15, 2022
Fair Value of Debt Instrument				518	399	605	509
Short-term debt	12
Type of instrument	interest rate swap
Notional amount	500
Basis spread on Variable rate	4.377%
Underlying risk	interest rate
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%
Fair Value, Derivatives [Line Items]
Interest Rate Fair Value Hedge Asset		5.8	11.6
Interest Rate Fair Value Hedge Liability		$ 5.1	$ 11.7

X

- Definition

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

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

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-Publisher FASB

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-Name Accounting Principles Board Opinion (APB)

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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.

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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.

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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.

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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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- 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.

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

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- Definition

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+ References

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