Incentive Plans (Summary Of Stock Option Program) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Share-based compensation arrangement by share-based payment award, options, grants in period, net of forfeitures	4,744	2,513
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value	$ 48.11	$ 35.94
Options, outstanding	9,136,060	15,556,786	18,245,253
Options, exercised	(7,317,825)	(3,200,642)	(1,850)
Options, forfeited			(21,070)
Options, expired	(70,190)	(3,222,597)	(2,665,547)
Options, outstanding	1,752,789	9,136,060	15,556,786	18,245,253
Weighted average exercise price, outstanding	$ 38.79	$ 38.13	$ 37.73
Weighted average exercise price, exercised	$ 38.57	$ 33.62	$ 32.54
Weighted average exercise price, forfeited			$ 35.21
Weighted average exercise price, outstanding	$ 39.80	$ 38.79	$ 38.13	$ 37.73
Aggregate intrinsic value, outstanding	$ 16,175	$ 1,077	$ 0	$ 0
Weighted average remaining life (years), outstanding	8 months 2 days	1 year 1 month 24 days	1 year 6 months 18 days	2 years 3 months 18 days
Share-based compensation arrangements by share-based payment award, options, expirations in period, weighted average exercise price	$ 37.15	$ 40.71	$ 35.45