Stock-Based Compensation Plans (Summary Of Stock Option Activity) (Detail) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, at beginning of period, Number of Shares	2,906,253	2,476,645
Options outstanding, at beginning of period, Weighted-Average Exercise Price (in dolars per share)	$ 28.10	$ 28.99
Options granted, Number of Shares	0	436,043
Options granted, Weighted-Average Exercise Price (in dolars per share)	$ 0.00	$ 23.00
Options exercised, Number of Shares	18,995	18,995
Options exercised, Weighted-Average Exercise Price (in dolars per share)	$ 19.83	$ 19.83
Options forfeited or expired, Number of Shares	53,338	59,773
Options forfeited or expired, Weighted-Average Exercise Price (in dolars per share)	$ 39.95	$ 38.69
Options outstanding, at end of period, Number of Shares	2,833,920	2,833,920
Options outstanding, at end of period, Weighted-Average Exercise Price (in dolars per share)	$ 27.93	$ 27.93
Options exercisable, at end of period, Number of Shares	2,128,154	2,128,154
Options exercisable, at end of period, Weighted-Average Exercise Price (in dolars per share)	$ 29.57	$ 29.57
Options expected to vest, at end of period, Number of Shares	628,032	628,032
Options expected to vest, at end of period, Weighted-Average Exercise Price (in dolars per share)	$ 22.97	$ 22.97