Shareholders' Equity (Schedule Of Changes In Each Class Of Shares) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Shareholders' Equity [Abstract]
Beginning balance, Common Stock	1,012,261,159	1,012,261,159	1,012,261,159
Ending balance, Common Stock	1,012,261,159	1,012,261,159	1,012,261,159
Beginning balance, Treasury Stock	277,002,059	256,406,709	285,661,944
Issued, Treasury Stock	(9,445,671)	(9,353,570)	(30,428,387)
Acquired, Treasury Stock			1,173,152
ShareValue Trust termination, Treasury Stock		29,948,920
Ending balance, Treasury Stock	267,556,388	277,002,059	256,406,709
Beginning balance, Share Value Trust		29,563,324	28,460,769
Acquired, Share Value Trust		385,596	1,102,555
ShareValue Trust termination, Share Value Trust		(29,948,920)
Ending balance, Share Value Trust			29,563,324