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Fair Value (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Fair value debt instruments [Line Items]
Type of instrument	interest rate swaps
Notional amount		$ 500,000,000
Basis spread on Variable rate		4.377%
Underlying risk	interest rate
Hedge designation	fair value hedges
Amount of hedged item		500,000,000
Description of hedged item	senior notes due 2013
Fair Value, Inputs, Level 2 [Member] | Senior notes due 2017 [Member]
Fair value debt instruments [Line Items]
Face Value of Debt Instrument	400,000,000
Maturity Date	Nov. 15, 2017
Fair Value of Debt Instrument	398,000,000
Fair Value, Inputs, Level 2 [Member] | Senior Notes 2018 [Member]
Fair value debt instruments [Line Items]
Face Value of Debt Instrument	800,000,000
Maturity Date	Oct. 01, 2018
Fair Value of Debt Instrument	787,000,000
Fair Value, Inputs, Level 2 [Member] | Senior Notes due 2019 [Member]
Fair value debt instruments [Line Items]
Face Value of Debt Instrument	500,000,000
Maturity Date	Sep. 01, 2019
Fair Value of Debt Instrument	581,000,000
Fair Value, Inputs, Level 2 [Member] | Senior notes due 2022 [Member]
Fair value debt instruments [Line Items]
Face Value of Debt Instrument	500,000,000
Maturity Date	Nov. 15, 2022
Fair Value of Debt Instrument	462,000,000
Estimate of Fair Value Measurement [Member]
Fair value debt instruments [Line Items]
Short-term debt	$ 8,000,000

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- 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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- Definition

Face (par) amount of debt instrument at time of issuance.

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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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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

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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

-Paragraph 22

-Article 5



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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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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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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

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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Description of primary underlying risk exposure associated with the derivative, for example, but not limited to, interest rate risk, credit risk, foreign exchange rate risk, or price risk.

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Description of the types of hedge designations that are used for interest rate derivatives, such as cash flow hedge, fair value hedge, hedge of net investment in foreign operations, or no hedge designation.

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Fair value portion of notes payable.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

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