Stock-Based Incentive Compensation Plans (Compensation expense for all stock-based incentive compensation plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee service share-based compensation, aggregate disclosures [Abstract]
Compensation expense	$ 40	$ 31	$ 22
Recognized tax benefit	14	11	8
Stock options [Member]
Employee service share-based compensation, aggregate disclosures [Abstract]
Compensation expense	9	8	8
Performance Shares [Member]
Employee service share-based compensation, aggregate disclosures [Abstract]
Compensation expense	10	5	2
Stock appreciation rights [Member]
Employee service share-based compensation, aggregate disclosures [Abstract]
Compensation expense	5	1
Restricted Stock Units And Non-Vested Stock [Member]
Employee service share-based compensation, aggregate disclosures [Abstract]
Compensation expense	$ 16	$ 17	$ 12