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Background and Basis of Presentation Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended | 13 Months Ended | 18 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Jul. 31, 2015 | Sep. 30, 2014 | Jul. 31, 2014 | Aug. 31, 2013 | Apr. 30, 2013
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase of common stock, shares | 5.2 | 3.3 | 8.8 | 10.8 |  |  |  |  |  |
Repurchases of common stock, value | $ 263,000,000 | $ 132,000,000 | $ 455,000,000 | $ 404,000,000 | $ 939,000,000 |  |  |  |  |
Average price of repurchased shares, per share | $ 50.64 | $ 40.72 | $ 51.63 | $ 37.40 |  |  |  |  |  |
April 2013 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Planned share repurchase program |  |  |  |  |  |  |  |  | $ 1,000,000,000 | $ 300,000,000
Repurchase of common stock, shares |  |  |  |  |  |  | 27.1 |  |  |
Average price of repurchased shares, per share |  |  |  |  |  |  | $ 36.97 |  |  |
July 2014 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Planned share repurchase program |  |  |  |  |  |  |  | $ 1,000,000,000 |  |
Amount remaining in the repurchase program | $ 63,000,000 |  | $ 63,000,000 |  |  |  |  |  |  |
Subsequent Event [Member] | July 2014 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase of common stock, shares |  |  |  |  |  | 20.4 |  |  |  |
Average price of repurchased shares, per share |  |  |  |  |  | $ 48.90 |  |  |  |
Subsequent Event [Member] | July 2015 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Planned share repurchase program |  |  |  |  |  | $ 1,000,000,000 |  |  |  |

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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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