Represents percentage of shares repurchased during the period of total number of shares of the entity.

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- Definition

Dollar amount of the cash payment to or cash received from the bank; or the stock issuance to (stock received from) the bank in the settlement of the accelerated share repurchase agreement.

+ References

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

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 99-7

-Paragraph 1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount authorized by an entity's Board of Directors under a stock repurchase plan.

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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.

+ Details

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Data Type:	xbrli:stringItemType
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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

+ Details

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Subsequent Event (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended						1 Months Ended
	Sep. 30, 2011	Aug. 31, 2011	May 31, 2010	Feb. 28, 2010	Aug. 05, 2011	Feb. 22, 2010	Nov. 30, 2011 Share repurchase	Oct. 30, 2011 Share repurchase	Nov. 02, 2011 Share repurchase
Subsequent Event
Accelerated share repurchase agreement amount		$ 125		$ 125				$ 100
Advance payment under agreement					$ 125.0	$ 125.0			$ 100.0
Shares received (in shares)	526,532	3,077,976	398,206	4,323,598			2,523,836
Percentage of treasury stock acquired of total stock					90.00%	90.00%			90.00%