Shareholders' Equity (Schedule Of Changes In Each Class Of Shares) (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Stock Issued During Period, Shares, Treasury Stock Reissued	6,376,868	7,288,113	6,719,270
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	345,637,354	305,533,606	264,882,461
Acquired, Treasury Stock	55,849,082	47,391,861	47,370,415
Ending balance, Treasury Stock	395,109,568	345,637,354	305,533,606