Shares and Stockholders' Equity (Changes In Preferred And Common stock (Number Of Shares)) (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 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	239,005,252
Common stock as of end-of-period:
Basic basis	239,005,252	252,928,502
Diluted basis	242,238,533	257,232,725
Common Stock
Changes In Preferred And Common Stock Number Of Shares [Line Items]
Balance as of beginning-of-year	243,835,893	256,551,440
Stock issued for exercise of warrants	24,813	946,926
Stock compensation/issued for benefit plans	660,605	1,473,401
Retirement/cancellation of shares	(5,516,059)	(6,043,265)
Balance as of end-of-period	239,005,252	252,928,502