Shares and Stockholders' Equity (Changes In Preferred And Common stock (Number Of Shares)) (Details) - shares		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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		226,335,105	243,835,893
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	262,896,701
Stock issued for exercise of warrants		79,397	1,168,966	4,356,385
Stock compensation/issued for benefit plans		1,732,812	2,108,155	1,770,430
Retirement/cancellation of shares		(19,312,997)	(15,992,668)	(12,472,076)
Balance as of end-of-period		226,335,105	243,835,893	256,551,440
Common stock as of end-of-period:
Assuming conversion of preferred stock		226,335,105	243,835,893	256,551,440
Diluted basis	[1]	230,126,820	247,732,609	261,538,593

[1] Effective October 1, 2016, we early adopted ASU 2016-09, Improvements to Employee Share-Based Payment Accounting. We have updated certain previously reported interim results and metrics as of January 1, 2016, in accordance with the new guidance. For more information, see "Note 1 - Earnings Per Share".