Stock-Based Compensation (Details Textual) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 2011 Omnibus Incentive Plan	Oct. 31, 2011 2011 Omnibus Incentive Plan	Dec. 31, 2013 Stock Options	Dec. 31, 2013 Restricted Stock	Dec. 31, 2013 Performance Based Shares
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares	1.5	2.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Outstanding, Weighted Average Grant Date Fair Value	$ 26.90	$ 27.14
Share-based Compensation by Share Based Payment Award, Options, Nonvested, Outstanding, Aggregate Intrinsic Value	$ 27
Requisite service periods	3 years			3 years
Shares initially available for awards					18
Shares available for future grant				10
Unamortized compensation expense						6	17	1
Weighted average period						1 year 6 months	1 year 8 months 12 days	2 years 2 months 12 days
Amount of cash received from the exercise of stock options	22
Tax benefit from the exercise of stock options	8
Share-based compensation	27	22	13
Share-based Compensation, Costs Related to Restructuring and Asset Impairment Charges (Less than $1 million)	1
Aggregate intrinsic value of outstanding stock options	28
Aggregate intrinsic value of exercisable stock options	16
Total intrinsic value of options exercised	$ 7.0
Share-based Compensation Arrangement by Share-based Payment Award, Target Payout Percentage	100.00%