Shares and Stockholders' Equity (Changes In Common stock (Number Of Shares)) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Changes In Common Stock (Number Of Shares) [Line Items]
Balance as of beginning-of-year			205,862,760
Balance as of end-of-period	200,775,731		200,775,731
Common stock as of End-of-Period
Basic basis	200,775,731	217,294,051	200,775,731	217,294,051
Diluted basis	202,245,662	220,722,270	202,245,662	220,722,270
Common Stock [Member]
Changes In Common Stock (Number Of Shares) [Line Items]
Balance as of beginning-of-year	202,987,229	218,695,476	205,862,760	218,090,114
Stock issued for exercise of warrants	18,493	2,826	222,023	22,866
Stock compensation/issued for benefit plans	83,405	51,644	893,075	636,966
Retirement/cancellation of shares	(2,313,396)	(1,455,895)	(6,202,127)	(1,455,895)
Balance as of end-of-period	200,775,731	217,294,051	200,775,731	217,294,051