Antidilutive Shares (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Antidilutive Securities
Antidilutive Stock Options, Exercise Price Greater Than Average Market Price	6.6	[1]	8.9	[1]	15.6	[1]
Preferred stock outstanding
Antidilutive Securities
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0		0		16.2

[1] These options are outstanding at the end of the respective periods. In any period in which the exercise price is less than the average market price, these options have the potential to be dilutive, and application of the treasury stock method would reduce this amount.