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Stockholders' Equity (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 132 Months Ended | 1 Months Ended | 26 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Feb. 28, 2013 December 2012 Buyback Plan [Member] | Dec. 31, 2012 December 2012 Buyback Plan [Member] | Jun. 30, 2013 December 2012 Buyback Plan [Member] | Jun. 30, 2001 June 2001 Buyback Plan [Member] | Jun. 30, 2012 June 2001 Buyback Plan [Member] | Apr. 30, 2011 April 2011 Buyback Plan [Member] | Jun. 30, 2013 April 2011 Buyback Plan [Member]
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Payment for the repurchase of common stock | $ 1,000 | $ 400 | $ 1,000 |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | 1,000 |  | 2,000 |  | 2,000 |
Stock Repurchased and Retired During Period, Shares |  | 7.8 |  |  | 20.4 |  | 42.0 |  | 5.5
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  |  | $ 284

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- Definition The cash outflow to reacquire common stock during the period. + 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: 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 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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