Incentive Plans (Summary Of Performance Share Program Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares/units, outstanding	8,660,855	8,060,059	6,812,594	8,117,489
Shares/units, granted	3,148,445	3,641,911	4,314,376
Shares/units, shares issued	(3,262,760)	(2,871,367)	(2,565,971)
Shares/units, forfeited	(429,051)	(169,748)	(500,940)
Weighted average grant date fair value, outstanding	$ 28.37	$ 22.83	$ 23.31	$ 31.20
Weighted average grant date fair value, granted	$ 40.76	$ 31.57	$ 28.04
Weighted average grant date fair value, shares issued	$ 32.48	$ 16.83	$ 32.43
Weighted average grant date fair value, forfeited	$ 34.58	$ 28.89	$ 25.07