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Compensation Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2012
Compensation [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The deferred compensation agreement values were estimated using the Monte Carlo valuation model with the following assumptions:
| December 31,
| 2011 |  | 2010
Exercise price | $ | 19.50 |  |  | $ | 19.50 |
Options outstanding (in millions) | 2 |  |  | 2 |
Expected volatility | 60 | % |  | 58 | %
Expected dividend yield | — | % |  | — | %
Risk-free rate over the estimated expected life | 0.17 | % |  | 0.59 | %
Expected option life (in years) | 1.5 |  |  | 2 |
Fair value of options (in millions) | $ | 8 |  |  | $ | 7 |
Fair value of vested portion of options (in millions) | $ | 8 |  |  | $ | 7 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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