Earnings Per Share (Details Textuals) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Additional Earnings Per Share (Textuals) [Abstract]
Restricted stock units outstanding	1.4	1.7	1.4	1.7
Antidilutive stock options	2	13	2	13	[1]
Time Based Options [Member]
Earnings Per Share (Textuals) [Abstract]
Outstanding time-based stock options	9.9	12.3	9.9	12.3
Performance Based Options [Member]
Earnings Per Share (Textuals) [Abstract]
Outstanding performance-based stock options	7.5	8.6	7.5	8.6

[1] The 2010 Unaudited Condensed Consolidated Statement of Cash Flows has been recast to conform to the new balance sheet presentation. See Note 2 - Basis of Presentation and Significant Accounting Policies for details.