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Equity Equity (Stock Repurchases) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 12 Months Ended | 66 Months Ended
--- | --- | --- | ---
May. 18, 2015 | Dec. 31, 2015 | Dec. 31, 2013 | Dec. 31, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Sale of shares by noncontrolling interest, Shares | 60.0 |  |  |
Sale of shares by noncontrolling interest, per share | $ 13.25 |  |  |
Acquisition of treasury stock (shares) |  | 39.7 |  | 145.6
Treasury Stock Acquired, Average Cost Per Share |  |  |  | $ 12.31
Treasury Stock, Value, Acquired, Cost Method |  | $ 0 | $ 0 | $ 1,800
share repurchase program CIC buyback [Domain] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Acquisition of treasury stock (shares) | 20.0 |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 13.07 |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 261 |  |  |
Common Stock [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Sale of shares by noncontrolling interest, Shares | 40.0 |  |  |

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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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