The number of days which stock purchased in the employee stock purchase plan must be held by the employee.

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- Definition

Performance-based restricted stock awards granted

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Potential Performance Award Percentage

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No definition available.

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- Definition

Share based compensation arrangement by share based payment award vesting proportion per year.

+ References

No definition available.

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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.

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- Definition

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

+ References

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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- Definition

The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

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- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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- Definition

Discount rate from fair value on purchase date that participants pay for shares.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(2)

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

+ References

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

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

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(2)

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Share-Based Compensation Plans (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unused shares	1,900,000
Share-based compensation plan, vesting proportion per year	one-third
Performance-based restricted stock awards granted	23,000	16,000
Share-Based Compensation Plans (Textual) [Abstract]
Total unrecognized pre-tax compensation expense	$ 23,000,000
Unrecognized compensation costs weighted-average period	1 year 8 months 15 days
Total fair value of equity awards	18,000,000	12,000,000	12,000,000
Total intrinsic value of option exercised	28,000,000	30,000,000	6,000,000
Total cash received exercised stock option	46,000,000	87,000,000
Common stock issued	46,568,000	90,646,000	28,386,000
Tax benefits realized from share based employee compensation arrangements	1,000,000	5,000,000	1,000,000
Time Vested Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation plan, vesting period	3 years
Market Based Cash Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Liability related to the cash awards	$ 4,000,000	$ 2,000,000
Stock Option And Nonvested Stock Plan Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unused shares	1,700,000
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation plan, vesting period	3 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation plan, vesting period	1 year
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share authorized	4,500,000
Unused shares	300,000
Percentage of payroll deductions of eligible compensation	15.00%
Percentage of share purchased fair market value	85.00%
Employee stock purchase plan holding period	90 days
Minimum [Member] \| Market Based Restricted Stock Rights, 2012 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential performance award percentage		25.00%
Maximum [Member] \| ROC performance based restricted stock rights, 2013 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential performance award percentage	125.00%
Maximum [Member] \| Market Based Restricted Stock Rights, 2012 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential performance award percentage	125.00%	125.00%