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Equity Stock Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 69 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock Repurchased During Period, Shares | 8.7 |  | 154.3
Stock Repurchased During Period, Value | $ 79 | $ 35 | $ 1,900
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 264 |  | $ 264
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 12.12

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- Definition Amount remaining of a stock repurchase plan authorized. + 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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