Stock-Based Incentive Plans (Schedule Of Stock Option Activity) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Stock-Based Incentive Plans [Abstract]
Outstanding, Options	2,763,482		2,332,816		2,236,773
Granted, Options			644,800		216,100
Exercised, Options	(196,145)	[1]	(7,000)		(35,890)
Canceled, Options	(158,115)		(207,134)		(84,167)
Outstanding, Options	2,409,222	[2]	2,763,482		2,332,816
Outstanding, Weighted-Average Option Price Per Share	$ 48.12		$ 53.61		$ 55.19
Granted, Weighted-Average Option Price Per Share			$ 28.26		$ 27.76
Exercised, Weighted-Average Option Price Per Share	$ 29.14	[1]	$ 26.05		$ 12.63
Canceled, Weighted-Average Option Price Per Share	$ 53.93		$ 48.90		$ 46.69
Outstanding, Weighted-Average Option Price Per Share	$ 49.28		$ 48.12		$ 53.61
Granted, Weighted-Average Fair Value Per Option		[3]	$ 9.00	[3]	$ 7.51	[3]
Exercised, Intrinsic Value	$ 3	[1]			$ 1
Outstanding, Intrinsic Value	12
Exercisable, Option	1,965,179.00	[2]	1,831,871.00		1,702,042.00
Exercisable, Weighted-Average Option Price Per Share	$ 54.05		$ 57.57		$ 61.35
Exercisable, Intrinsic Value	$ 6

[1] Cash received by the Company upon exercise amounted to $6 million and the related tax benefit realized amounted to less than $1 million.

[2] ***The weighted-average remaining contractual term of outstanding options and exercisable options was 6.1 and 5.7 years, respectively.

[3] Represents the weighted-average fair value per unit as of the date of grant.