Shares and Stockholders' Equity (Changes In Preferred And Common stock (Number Of Shares)) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Changes In Preferred And Common Stock Number Of Shares [Line Items]
Balance as of beginning-of-year			243,835,893
Balance as of end-of-period	228,529,287		228,529,287
Common stock as of end-of-period:
Basic basis	228,529,287	247,464,931	228,529,287	247,464,931
Diluted basis	231,277,156	251,220,934	231,277,156	251,220,934
Common Stock
Changes In Preferred And Common Stock Number Of Shares [Line Items]
Balance as of beginning-of-year	232,784,691	250,918,893	243,835,893	256,551,440
Stock issued for exercise of warrants	16,767	188,530	54,915	1,168,966
Stock compensation/issued for benefit plans	46,267	40,031	716,409	2,028,913
Retirement/cancellation of shares	(4,318,438)	(3,682,523)	(16,077,930)	(12,284,388)
Balance as of end-of-period	228,529,287	247,464,931	228,529,287	247,464,931