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Derivatives - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) derivative_instrument
Derivative [Line Items]
Hedging ineffectiveness recorded in earnings	$ 0	$ 0	$ 0	$ 0
Estimated loss reclassified from other comprehensive income (loss) to earnings as contracts settle			3,000,000
Designated [Member]
Derivative [Line Items]
Derivative liability notional amount					$ 750,000,000
Derivative notional amount	$ 750,000,000		$ 750,000,000
Designated [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Number of interest rate swaps | derivative_instrument					8
Not designated [Member] | Interest rate contracts [Member]
Derivative [Line Items]
Reclassification from OCI to interest expense related to the derivatives net of tax		$ 2,000,000		$ 5,000,000

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 estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

+ References

No definition available.

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4C



-Subparagraph (d)



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-SubTopic 25



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- Definition

Nominal or face amount used to calculate payments on the derivative liability.

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The number of derivative instruments of a particular group held by the entity.

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-SubTopic 10



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- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

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