Share-Based Employee Compensation Plans and Other Compensation and Benefit Plans (Black-Scholes Option Pricing Model) (Details) (Stock Option [Member])	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Option [Member]
Risk-free interest rate	0.59%	1.16%	1.67%
Expected life	3 years 10 months 24 days	3 years 8 months 12 days	4 years 3 months 18 days
Expected volatility	33.50%	33.30%	33.90%
Expected dividend yield	0.00%	0.00%	0.00%