Common Stock, Dividends, Rate Increase, Percent.

No definition available.

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

+ Details

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- Definition

Reflects the known or estimated financial effect of the event, or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued.

+ References

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

-Publisher FASB

-Topic 855

-SubTopic 10

-Section 50

-Paragraph 2

-Name Accounting Standards Codification

-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 165

-Paragraph 13

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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- Definition

Describes the event or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 855

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 165

-Paragraph 13

-Subparagraph a

-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.

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- Details

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Period Type:	duration

- Definition

Date of subsequent event occurrence or of indication that subsequent event occurred.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 855

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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Subsequent Events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended
	Apr. 30, 2011	Apr. 24, 2012 Dividend Declared [Member]	Apr. 24, 2012 Dividend Increase [Member]	Apr. 30, 2011 Quarterly [Member] Previous [Member]	Apr. 24, 2012 Quarterly [Member] Previous [Member] Dividend Increase [Member]	Apr. 30, 2011 Quarterly [Member] Subsequent [Member]	Apr. 24, 2012 Quarterly [Member] Subsequent [Member] Dividend Increase [Member]	Apr. 30, 2011 Annual [Member] Previous [Member]	Apr. 24, 2012 Annual [Member] Previous [Member] Dividend Increase [Member]	Apr. 30, 2011 Annual [Member] Subsequent [Member]	Apr. 24, 2012 Annual [Member] Subsequent [Member] Dividend Increase [Member]
Subsequent Event [Line Items]
Subsequent event, date		Apr. 05, 2012	Apr. 23, 2012
Subsequent event, description		The cash dividends are for the period from February 1, 2012 to April 30, 2012 and will be paid on May 1, 2012 to holders of record as of April 17, 2012.	Common Stock cash dividend rate increase, which will be applicable to dividends payable beginning in August 2012.
Subsequent event, amount		$ 9
Common stock, dividends, per share, declared		$ 0.06		$ 0.05	$ 0.06	$ 0.06	$ 0.075	$ 0.2	$ 0.24	$ 0.24	$ 0.30
Common stock, dividends, rate increase, percent	20.00%		25.00%