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Equity Level 4 Preferred Stock & SE Warrants (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | Mar. 23, 2010 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013
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Class of Stock [Line Items] |  |  |  |  |
Depository shares, issued | 23.0 |  |  |  |
Interest in mandatory convertible preferred stock series F represented by each depositary share | 1/40th |  |  |  |
Sale of depository shares price per share | $ 25 |  |  |  |
Net proceeds from issuance of depository shares | $ 556 |  |  |  |
Exercise price of warrant |  | $ 9.264 | $ 9.388 | $ 9.504 |
Series F Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Cumulative dividend on mandatory convertible preferred stock | 7.25% |  |  |  |
Preferred stock, liquidation preference per share | $ 1,000 |  |  |  |
Convertible preferred stock shares, Series F, reserved for future issuance |  |  |  |  | 21.2

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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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