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Subsequent Events (Details) (USD $) In Millions, except Share data, unless otherwise specified | 6 Months Ended | 24 Months Ended | 27 Months Ended | 30 Months Ended | 1 Months Ended | 31 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jul. 09, 2012 | Mar. 31, 2012 | Jun. 30, 2012 | Aug. 03, 2012 Stock Repurchase Plan | Aug. 03, 2012 Stock Repurchase Plan | Aug. 01, 2012 Dividend Declared [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |
Total repurchase amount authorized |  | $ 500 | $ 680 |  |  |  |
Acquisition of treasury stock (shares) | 18,744,363 |  |  | 52,669,168 | 1,734,000 | 54,403,168 |
Treasury Stock Value Acquired Cost Method Excluding Commissions | $ 230 |  |  | $ 608 | $ 22 | $ 630 |
Dividends Payable, Amount Per Share |  |  |  |  |  |  | $ 0.04
Treasury Stock Acquired Average Cost Per Share | $ 12.31 |  |  | $ 11.57 |  | $ 11.60 |

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 1 -Section B -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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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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