Stock-Based Compensation Plans (Summary Of Stock Option Activity) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2010
Outstanding and exercisable, beginning balance, shares	5.7
Outstanding and exercisable, beginning balance, weighted average exercise price	$ 31.66
Outstanding and exercisable, beginning balance weighted average remaining contractual term	1.1
Outstanding and exercisable, beginning balance, weighted average fair value at date of grant	$ 9.15	$ 12.16
Exercised, shares	(0.2)
Exercised, weighted average exercise price	$ 11.67
Forfeited/cancelled, shares	(2.3)
Forfeited/cancelled, weighted average exercise price	$ 41.99
Exercisable, shares	3.2
Exercisable, weighted average exercise price	$ 25.98
Exercisable, weighted average remaining contractual term	0.9
Exercisable, weighted average fair value at date of grant	$ 10.17
Outstanding and unvested, beginning balance, shares	0
Outstanding and unvested, beginning balance, weighted average exercise price	$ 0.00
Granted, shares	0.7
Granted, weighted average exercise price	$ 13.79
Granted, weighted average remaining contractual term	9.3
Granted, weighted average fair value at date of grant	$ 4.06
Unvested forfeited/cancelled shares	0
Unvested forfeited/cancelled, weighted average exercise price	$ 13.76
Outstanding and unvested, ending balance, shares	0.7	0
Outstanding and unvested, ending balance, weighted average exercise price	$ 13.79	$ 0.00
Outstanding and unvested, weighted average remaining contractual term	9.3
Outstanding and unvested, weighted average fair value at date of grant	$ 4.06
Outstanding and exercisable, ending balance, shares	3.9	5.7
Outstanding and exercisable, ending balance, weighted average exercise price	$ 23.91	$ 31.66
Outstanding and exercisable, ending balance weighted average remaining contractual term	2.4	1.1
Outstanding and exercisable, ending balance, weighted average fair value at date of grant	$ 9.15	$ 12.16