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Background and Basis of Presentation (Share Repurchase Program) (Details) (USD $) | 12 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | 18 Months Ended | 1 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jan. 31, 2011 January 2011 Share Repurchase Program [Member] | Sep. 30, 2011 January 2011 Share Repurchase Program [Member] | Oct. 31, 2012 October 2011 Share Repurchase Program [Member] | Oct. 31, 2011 October 2011 Share Repurchase Program [Member] | Mar. 31, 2013 October 2011 Share Repurchase Program [Member] | Aug. 31, 2013 April 2013 Share Repurchase Program [Member] | Apr. 30, 2013 April 2013 Share Repurchase Program [Member] | Dec. 31, 2013 April 2013 Share Repurchase Program [Member] | Dec. 31, 2013 April 2013 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Planned share repurchase program |  |  |  | $ 1,000,000,000 |  | $ 1,500,000,000 | $ 1,000,000,000 |  | $ 1,000,000,000 | $ 300,000,000 |  |
Repurchase of common stock, shares | 16,652,913 | 34,860,000 | 49,324,883 |  | 37,600,000 |  |  | 48,300,000 |  |  | 15,000,000 |
Repurchases of common stock, value | 600,000,000 | 1,116,000,000 | 1,327,000,000 |  |  |  |  |  |  |  | 543,000,000 |
Average price of repurchased shares, per share | $ 36.05 | $ 32.00 | $ 26.91 |  | $ 26.62 |  |  | $ 31.06 |  |  | $ 36.27 |
Amount remaining in the repurchase program |  |  |  |  |  |  |  |  |  |  |  | $ 457,000,000

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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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- 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 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 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 Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + 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 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=27012166&loc=d3e187085-122770 Reference 4: 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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