Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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Unrecognized cost of unvested options awarded to employees as compensation.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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

-Publisher FASB

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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Gross number of share options (or share units) granted during the period.

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No definition available.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Aggregate Intrinsic Value

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Stock-based compensation plans.

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Share-Based Compensation Plans (Details Textual) - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation	$ 4,000,000	$ 5,000,000	$ 8,000,000	$ 9,000,000
Shares Awarded (in shares)			677
Stock-Based Compensation Plans (Textual) [Abstract]
Amount of cash received from the exercise of stock options			$ 9,000,000	$ 17,000,000
Aggregate intrinsic value of outstanding stock options	22,000,000		22,000,000
Aggregate intrinsic value of exercisable stock options	20,000,000		20,000,000
Aggregate intrinsic value of vested and expected to vest stock options	22,000,000		22,000,000
Total intrinsic value of options exercised			3,000,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Unamortized compensation expense	8,000,000		$ 8,000,000
Weighted average period			2 years 2 months
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Unamortized compensation expense	26,000,000		$ 26,000,000
Weighted average period			2 years 2 months
Shares Awarded (in shares)			388
Performance Based Shares
Share-based Compensation Arrangement by Share-based Payment Award
Unamortized compensation expense	$ 5,000,000		$ 5,000,000
Weighted average period			2 years 2 months
Shares Awarded (in shares)			98