Shares and Stockholders' Equity (Changes In Common stock (Number Of Shares)) (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes In Preferred And Common Stock Number Of Shares [Line Items]
Balance as of beginning-of-year	218,090,114
Balance as of end-of-year	205,862,760	218,090,114
Common Stock [Member]
Changes In Preferred And Common Stock Number Of Shares [Line Items]
Balance as of beginning-of-year	218,090,114	226,335,105	243,835,893
Stock issued for exercise of warrants	212,670	344,901	79,397
Stock compensation/issued for benefit plans	800,325	1,793,234	1,732,812
Retirement/cancellation of shares	(13,240,349)	(10,383,126)	(19,312,997)
Balance as of end-of-year	205,862,760	218,090,114	226,335,105
Common stock as of End-of-year
Basic basis	205,862,760	218,090,114	226,335,105
Diluted basis	209,034,686	221,309,830	230,126,820