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Background and Basis of Presentation Share Repurchase Program (Details) (USD $) | 3 Months Ended | 12 Months Ended | 1 Months Ended | 18 Months Ended | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | 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] | Mar. 31, 2014 April 2013 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Planned share repurchase program |  |  |  | $ 1,500,000,000 | $ 1,000,000,000 |  | $ 1,000,000,000 | $ 300,000,000 |
Repurchase of common stock, shares | 7,500,000.0 | 1,700,000.0 |  |  |  | 48,300,000 |  |  |
Repurchases of common stock, value | 272,000,000 | 57,000,000 | 600,000,000 |  |  |  |  |  |
Average price of repurchased shares, per share | $ 35.98 | $ 34.05 |  |  |  | $ 31.06 |  |  |
Amount remaining in the repurchase program |  |  |  |  |  |  |  |  | $ 185,000,000

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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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