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Schedule of Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Jun. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2012
Common Stock, Shares, Outstanding beginning of period |  |  | 75,556,272 | 75,556,272 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | $ 1,730 | $ 1,730 |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  |  | 3 |
Proceeds from Issuance of Common Stock | 20 |  | 47 | 67 | 0
Net Income (Loss) Attributable to Parent | 31 | 38 |  | 58 | 113
Net Income (Loss) Attributable to Noncontrolling Interest | 0 | (1) |  | (1) | (1)
Common Stock, Shares, Outstanding end of period | 78,067,299 |  |  | 78,067,299 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1,793 |  |  | 1,793 |
Common Stock [Member] |  |  |  |  |
Common Stock, Shares, Outstanding beginning of period |  |  | 75,556,272 | 75,556,272 | 75,362,956
Stock Issued During Period, Shares, New Issues | 700,000 |  | 1,665,000 | 2,365,000 |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  |  |  | 146,027 | 171,430
Common Stock, Shares, Outstanding end of period | 78,067,299 | 75,534,386 |  | 78,067,299 | 75,534,386
Common Stock Including Additional Paid in Capital [Member] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 841 | 841 | 836
Proceeds from Issuance of Common Stock |  |  |  | 67 |
Share-based Compensation |  |  |  | 2 | 2
Dividends, Common Stock |  |  |  | 0 | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 910 | 838 |  | 910 | 838
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | (6) | (6) | (6)
Share-based Compensation |  |  |  | 0 | 0
Dividends, Common Stock |  |  |  | 0 | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (6) | (6) |  | (6) | (6)
Retained Earnings [Member] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 893 | 893 | 833
Share-based Compensation |  |  |  | 0 | 0
Dividends, Common Stock |  |  |  | (63) | (61)
Net Income (Loss) Attributable to Parent |  |  |  |  | 113
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 888 | 885 |  | 888 | 885
Noncontrolling Interest [Member] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 2 | 2 | 3
Share-based Compensation |  |  |  | 0 | 0
Dividends, Common Stock |  |  |  | 0 | 0
Net Income (Loss) Attributable to Noncontrolling Interest |  |  |  |  | (1)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 1 | $ 2 |  | $ 1 | $ 2

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