Shares and Stockholders' Equity (Changes In Preferred And Common stock (Number Of Shares)) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 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	239,069,774		239,069,774
Common stock as of end-of-period:
Basic basis	232,784,691	250,918,893	232,784,691	250,918,893
Diluted basis	236,268,119	254,126,732	236,268,119	254,126,732
Common Stock
Changes In Preferred And Common Stock Number Of Shares [Line Items]
Balance as of beginning-of-year	239,005,252	252,928,502	243,835,893	256,551,440
Stock issued for exercise of warrants	13,335	33,510	38,148	980,436
Stock compensation/issued for benefit plans	9,537	515,481	670,142	1,988,882
Retirement/cancellation of shares	(6,243,433)	(2,558,600)	(11,759,492)	(8,601,865)
Balance as of end-of-period	232,784,691	250,918,893	232,784,691	250,918,893