Shareholders' Equity (Schedule Of Changes In Each Class Of Shares) (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common Stock, Number of Shares, Par Value and Other Disclosures [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
Treasury Stock, Number of Shares and Restriction Disclosures [Abstract]
Beginning balance, Treasury Stock	421,222,326	395,109,568	345,637,354
Stock Issued During Period, Shares, Treasury Stock Reissued	3,409,330	20,746,426	6,376,868
Acquired, Treasury Stock	26,806,974	46,859,184	55,849,082
Ending balance, Treasury Stock	444,619,970	421,222,326	395,109,568