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Stockholders' Equity (Share Repurchase Program) (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 132 Months Ended | 1 Months Ended | 29 Months Ended
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Sep. 30, 2013 | Sep. 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] | Sep. 30, 2013 April 2011 Buyback Plan [Member]
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 1,000 |  | $ 2,000 |  | $ 2,000 |
Payment for the repurchase of common stock | $ 1,000 | $ 400 | $ 1,000 |  |  |  |  |  | $ 284
Stock Repurchased and Retired During Period, Shares |  | 7.8 |  |  | 20.4 |  | 42.0 |  | 5.5

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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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + 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 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: 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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- Definition Amount of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
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