Shareholders' Equity (Schedule Of Changes In Each Class Of Shares) (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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	444,619,970	421,222,326	395,109,568
Stock Issued During Period, Shares, Treasury Stock Reissued	2,797,002	3,409,330	20,746,426
Acquired, Treasury Stock	7,529,437	26,806,974	46,859,184
Ending balance, Treasury Stock	449,352,405	444,619,970	421,222,326