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Plan Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2010
Incentive Compensation Plan Initiation Year	May 01, 2009
Performance condition of awards	range from 0% to 300% of the target amount
Maximum award value per employee	6.0
Restricted Cash Plan Initiation Year	Mar. 01, 2009
Stock options
Number of shares initially available for grant		8.1
Stock option expiration period in years	10 years
Stock options \| Minimum [Member]
Award vesting period, years	2 years
Stock options \| Maximum [Member]
Award vesting period, years	4 years
Other Stock-based Awards
Number of shares initially available for grant		26.5
Award vesting period, years	3 years

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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