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Equity (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  | $ 2,000,000 |
Proceeds from Issuance of Common Stock | 314,000,000 |  | 47,000,000 | 0
Common Stock, Shares, Outstanding beginning of period |  |  | 75,556,272 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 1,730,000,000 |
Net Income (Loss) Attributable to Parent | (22,000,000) | 26,000,000 |  | 75,000,000
Net Income (Loss) Attributable to Noncontrolling Interest | 0 | 0 |  | 0
Common Stock, Shares, Outstanding end of period | 77,362,458 |  | 77,362,458 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1,762,000,000 |  | 1,762,000,000 |
Share Price | $ 29.50 |  | $ 29.50 |
Sale of Stock, Price Per Share | $ 28.54 |  | $ 28.54 |
Common Stock, Discount on Shares | 0.96 |  | 0.96 |
stock offering | 11,100,000 |  |  |
Option Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value | 26,000,000 |  | 26,000,000 |
underwriters discount | 11,000,000 |  | 11,000,000 |
Net share settlement | 844,757 |  | 844,757 |
Common Stock [Member] |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 1,665,000 |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  |  | 141,186 | 164,325
Common Stock, Shares, Outstanding beginning of period |  |  | 75,556,272 | 75,362,956
Common Stock, Shares, Outstanding end of period | 77,362,458 | 75,527,281 | 77,362,458 | 75,527,281
Common Stock Including Additional Paid in Capital [Member] |  |  |  |
Proceeds from Issuance of Common Stock |  |  | 47,000,000 |
Share-based Compensation |  |  | 1,000,000 | 1,000,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 841,000,000 | 836,000,000
Dividends, Common Stock |  |  | 0 | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 889,000,000 | 837,000,000 | 889,000,000 | 837,000,000
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Share-based Compensation |  |  | 0 | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | (6,000,000) | (6,000,000)
Dividends, Common Stock |  |  | 0 | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (6,000,000) | (6,000,000) | (6,000,000) | (6,000,000)
Retained Earnings [Member] |  |  |  |
Share-based Compensation |  |  | 0 | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 893,000,000 | 833,000,000
Dividends, Common Stock |  |  | (42,000,000) | (41,000,000)
Net Income (Loss) Attributable to Parent |  |  | 27,000,000 | 75,000,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 878,000,000 | 867,000,000 | 878,000,000 | 867,000,000
Noncontrolling Interest [Member] |  |  |  |
Share-based Compensation |  |  | 0 | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 2,000,000 | 3,000,000
Dividends, Common Stock |  |  | 0 | 0
Net Income (Loss) Attributable to Noncontrolling Interest |  |  | (1,000,000) | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 1,000,000 | $ 3,000,000 | $ 1,000,000 | $ 3,000,000

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