Stock-Based Compensation Plans (Summary Of Stock Option Activity) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Outstanding, beginning balance, shares	3.9
Outstanding, beginning balance, weighted average exercise price	$ 23.90
Outstanding, beginning balance weighted average remaining contractual term	5 years 8 months 12 days	2 years 1 month 1 day
Outstanding, beginning balance, weighted average fair value at date of grant	$ 4.20	$ 10.17
Exercisable, beginning balance, shares	3.2
Exercisable, beginning balance, weighted average exercise price	$ 25.97
Exercisable, beginning balance, weighted average remaining contractual term	1 year 4 months 24 days	8 months 12 days
Exercisable, beginning balance, weighted average fair value at grant date	$ 9.15
Granted, shares	0.7
Granted, weighted average exercise price	$ 12.79
Granted, weighted average remaining contractual term	9.6
Granted, weighted average fair value at date of grant	$ 3.43
Exercised, shares	(0.5)
Exercised, weighted average exercise price	$ 11.69
Forfeited/cancelled, shares	(2.0)
Forfeited/cancelled, weighted average exercise price	$ 34.39
Outstanding, ending balance, shares	2.1	3.9
Outstanding, ending balance, weighted average exercise price	$ 12.74	$ 23.90
Outstanding, ending balance weighted average remaining contractual term	5 years 8 months 12 days	2 years 1 month 1 day
Outstanding, ending balance, weighted average fair value at date of grant	$ 4.20	$ 10.17
Exercisable, ending balance, shares	0.9	3.2
Exercisable, ending balance, weighted average exercise price	$ 12.04	$ 25.97
Exercisable, ending balance, weighted average remaining contractual term	1 year 4 months 24 days	8 months 12 days
Exercisable, ending balance, weighted average fair value at grant date	$ 4.79	$ 9.15
Stock Options [Member]
Outstanding, beginning balance, weighted average fair value at date of grant	$ 3.43
Granted, weighted average exercise price	$ 12.79
Outstanding, ending balance, weighted average fair value at date of grant	$ 3.43