Share-Based Incentive Compensation Programs (Summarized Information About Incentive Share, Deferred Share And Restricted Stock Units) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted
Exercised	(1,262,000)	(208,000)	(58,000)
Forfeited and cancelled
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at January 1, 2011	9,900,358
Granted	1,792,340
Exercised	(2,296,869)
Forfeited and cancelled	(62,116)
Outstanding at December 31, 2011	9,333,713
Deferred Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at January 1, 2011	85,719
Granted	8,919
Exercised	(22,341)
Forfeited and cancelled
Outstanding at December 31, 2011	72,297
Incentive Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at January 1, 2011	2,197,350
Granted
Exercised	(2,197,350)
Forfeited and cancelled
Outstanding at December 31, 2011