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Management Compensation Plans (Performance Units Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified		1 Months Ended	12 Months Ended
	Oct. 14, 2011	Dec. 31, 2008 Performance Units [Member]	Dec. 31, 2011 Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of number of shares that will vest			zero to stretch
Number of performance units granted		200,000
Performance units settled in cash	$ 10

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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