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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Common Stock, Shares, Outstanding beginning of period | 75,556,272 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 1,730 |
Net Income (Loss) Attributable to Parent | 49 | 49
Net Income (Loss) Attributable to Noncontrolling Interest | (1) | 0
Common Stock, Shares, Outstanding end of period | 75,677,181 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1,758 |
Common Stock [Member] |  |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures | 120,909 | 141,624
Common Stock, Shares, Outstanding beginning of period | 75,556,272 | 75,362,956
Common Stock, Shares, Outstanding end of period | 75,677,181 | 75,504,580
Common Stock Including Additional Paid in Capital [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 841 | 836
Dividends, Common Stock | 0 | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 841 | 836
Accumulated Other Comprehensive Income (Loss) [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (6) | (6)
Dividends, Common Stock | 0 | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (6) | (6)
Retained Earnings [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 893 | 833
Dividends, Common Stock | (20) | (20)
Net Income (Loss) Attributable to Parent |  | 49
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 922 | 862
Noncontrolling Interest [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 2 | 3
Dividends, Common Stock | 0 | 0
Net Income (Loss) Attributable to Noncontrolling Interest |  | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 1 | $ 3

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