Represents the common stock shares distributed to the holders of vested restricted stock units.

No definition available.

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- Definition

This element represents the low end of the range of the amortization period, in years, of the fair value of restricted shares.

+ References

No definition available.

+ Details

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- Definition

Represents the total fair value of equity-based awards issued during the period.

+ References

No definition available.

+ Details

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- Definition

This element represents the percentage of shares vested per year beginning on the first anniversary of the grant date.

+ References

No definition available.

+ Details

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- Definition

This element represents the period after which the shares granted can be vested.

+ References

No definition available.

+ Details

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- Definition

This element represents the shares of the Company's common stock, per unit, that holders of vested units receive.

+ References

No definition available.

+ Details

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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.

+ References

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ 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 (c)(2)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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 (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ 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 (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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 (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ 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 (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ References

No definition available.

+ Details

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- Definition

Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ References

No definition available.

+ Details

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Data Type:	xbrli:sharesItemType
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Stock Based Compensation - Restricted share and Restricted Share Units and Performance Vested Restricted Share Units (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares
Restricted share and Restricted Share Units and Performance Vested Restricted Share Units
Unrecognized compensation cost of unvested stock options, restricted shares, restricted share units and performance vested restricted share units (in dollars) \| $	$ 19
Weighted average period during which unrecognized compensation costs would be recognized	2 years
Restricted Shares and Restricted Share Units
Restricted share and Restricted Share Units and Performance Vested Restricted Share Units
Nonvested, beginning balance (in shares)	836,000
Granted (in shares)	601,000
Vested (in shares)	(255,000)
Forfeited (in shares)	(74,000)
Nonvested, ending balance (in shares)	1,108,000	836,000
Nonvested, Beginning balance (in dollars per share) \| $ / shares	$ 19.44
Granted (in dollars per share) \| $ / shares	20.01	$ 15.70	$ 22.69
Vested (in dollars per share) \| $ / shares	21.30
Forfeited (in dollars per share) \| $ / shares	18.31
Nonvested, Closing balance (in dollars per share) \| $ / shares	$ 19.39	$ 19.44
Total fair value of shares issued (in dollars) \| $	$ 5	$ 6	$ 4
Restricted Shares and Restricted Share Units \| Shares granted to employees after March 21, 2005 \| Minimum
Restricted share and Restricted Share Units and Performance Vested Restricted Share Units
Fair value of restricted shares, amortization period	1 year
Restricted Shares and Restricted Share Units \| Shares granted to employees after March 21, 2005 \| Maximum
Restricted share and Restricted Share Units and Performance Vested Restricted Share Units
Fair value of restricted shares, amortization period	4 years
Restricted Share Units \| Shares granted to directors after 2007
Share-based Compensation Arrangement by Share-based Payment Award
Period after which shares granted can be vested	1 year
Restricted Share Units \| Shares granted to employees after 2010
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of shares vested per year beginning on first anniversary	25.00%
Common stock distribution ratio	1
Performance Vested Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award
Period after which shares granted can be vested	3 years
Restricted share and Restricted Share Units and Performance Vested Restricted Share Units
Nonvested, beginning balance (in shares)	1,355,000
Granted (in shares)	528,000
Vested (in shares)	(66,000)
Forfeited (in shares)	(223,000)
Nonvested, ending balance (in shares)	1,594,000	1,355,000
Nonvested, Beginning balance (in dollars per share) \| $ / shares	$ 20.76
Granted (in dollars per share) \| $ / shares	19.57	$ 15.10	$ 23.63
Vested (in dollars per share) \| $ / shares	33.39
Forfeited (in dollars per share) \| $ / shares	29.23
Nonvested, Closing balance (in dollars per share) \| $ / shares	$ 18.66	$ 20.76
Total fair value of shares vested (in dollars) \| $	$ 2
Shares issued	66,000
Performance Vested Restricted Share Units \| Maximum
Restricted share and Restricted Share Units and Performance Vested Restricted Share Units
Shares of common stock holder may receive, per unit of vested units	2