Share-Based Compensation Plans (Schedule of Summary of Stock Options) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Outstanding, beginning balance, in shares	26,290
Granted, in shares	0
Exercised, in shares	(1,216)
Forfeited, in shares	(337)
Expired, in shares	(3,194)
Outstanding, ending balance, in shares	21,543
Exercisable, ending balance, in shares	19,869
Outstanding, beginning balance, weighted-average exercise price	$ 31.00
Granted, weighted-average exercise price	$ 0.00
Exercised, weighted-average exercise price	$ 15.73
Forfeited, weighted-average exercise price	$ 20.94
Expired, weighted-average exercise price	$ 29.22
Outstanding, ending balance, weighted-average exercise price	$ 32.27
Exercisable, ending balance, weighted-average exercise price	$ 32.73
Outstanding, ending balance, weighted-average contractual term, years	3 years 6 months
Outstanding, exercisable, weighted-average contractual term, years	3 years 2 months 12 days
Outstanding, ending balance, aggregate intrinsic value	$ 5.6
Exercisable, ending balance, aggregate intrinsic value	$ 5.6