Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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+ Details

Net Income Per Common Share (Schedule of Average Shares Excluded From Diluted Net Income Per Common Share Computation) (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average outstanding securities	16.0	17.1	15.1
Stock Options \| Minimum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price	29.81	25.34	36.24
Stock Options \| Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price	64.50	64.50	64.50
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average outstanding securities	0.3	6.0
Exercise price	30.36
Warrants \| Minimum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price		29.40
Warrants \| Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price		30.36