Earnings Per Common Share, Potentially Dilutive Securities (Details) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Common Equivalent Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Common Share
Amount of potentially dilutive securities excluded from computation of earnings per common share	0	[1]	6	[1]
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Common Share
Amount of potentially dilutive securities excluded from computation of earnings per common share	3	[2]	6	[2]

[1] (a)Common equivalent shares (primarily stock options) were excluded from weighted-average common shares outstanding – assuming dilution due to the net loss for the three months ended March 31, 2012.

[2] (b)Stock options were excluded from weighted-average common shares outstanding – assuming dilution because the exercise price of the stock option was greater than the average market price of our common shares during each reporting period.