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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Common Stock, Shares, Outstanding beginning of period |  |  | 75,362,956 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | $ 1,666 |
Net Income (Loss) Attributable to Parent | 38 | 27 | 113 | 118
Net Income (Loss) Attributable to Noncontrolling Interest | (1) | 0 | (1) | 0
Common Stock, Shares, Outstanding end of period | 75,534,386 |  | 75,534,386 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1,719 |  | 1,719 |
Common Stock [Member] |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  |  | 171,430 | 28,932
Common Stock, Shares, Outstanding beginning of period |  |  | 75,362,956 | 75,316,419
Common Stock, Shares, Outstanding end of period | 75,534,386 | 75,345,351 | 75,534,386 | 75,345,351
Common Stock Including Additional Paid in Capital [Member] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 836 | 831
Stock-based Compensation |  |  | 2 | 2
Dividends, Common Stock |  |  | 0 | 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 838 | 833 | 838 | 833
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | (6) | (5)
Stock-based Compensation |  |  | 0 | 0
Dividends, Common Stock |  |  | 0 | 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (6) | (5) | (6) | (5)
Retained Earnings [Member] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 833 | 766
Stock-based Compensation |  |  | 0 | 0
Dividends, Common Stock |  |  | (61) | (59)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  | 0
Net Income (Loss) Attributable to Parent |  |  | 113 | 118
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 885 | 825 | 885 | 825
Noncontrolling Interest [Member] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 3 | 7
Stock-based Compensation |  |  | 0 | 0
Dividends, Common Stock |  |  | 0 | 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  | (4)
Net Income (Loss) Attributable to Noncontrolling Interest |  |  | (1) | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 2 | $ 3 | $ 2 | $ 3

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