Shares and Stockholders' Equity (Changes In Preferred And Common stock (Number Of Shares)) (Details) - shares		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes In Preferred And Common Stock Number Of Shares [Line Items]
Balance as of beginning-of-period		256,551,440
Balance as of end-of-period		243,835,893	256,551,440
Common stock as of end-of-period:
Assuming conversion of preferred stock		243,835,893	256,551,440	262,896,701
Diluted basis		247,732,609	261,538,593	272,196,891
Series A Preferred Stock [Member]
Changes In Preferred And Common Stock Number Of Shares [Line Items]
Balance as of beginning-of-period				9,532
Conversion of convertible preferred stock	[1]			(5,818)
Redemption of convertible preferred stock				(3,714)
Balance as of end-of-period
Common Stock
Changes In Preferred And Common Stock Number Of Shares [Line Items]
Balance as of beginning-of-period		256,551,440	262,896,701	271,402,586
Conversion of convertible preferred stock	[1]			93,088
Common Stock Issued For Exercise Of Warrants		1,168,966	4,356,385	1,981,856
Stock compensation/issued for benefit plans		2,108,155	1,770,430	1,399,995
Retirement/cancellation of shares		(15,992,668)	(12,472,076)	(11,980,824)
Balance as of end-of-period		243,835,893	256,551,440	262,896,701

[1] Represents the conversion of Series A preferred stock into common stock.