Shares and Stockholders' Equity (Changes In Preferred And Common stock (Number Of Shares)) (Details) - shares		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Changes In Preferred And Common Stock Number Of Shares [Line Items]
Balance as of beginning-of-year		226,335,105
Balance as of end-of-period		224,888,259
Common stock as of end-of-period:
Basic basis		224,888,259	239,005,252
Diluted basis	[1]	228,934,631	242,176,232
Common Stock
Changes In Preferred And Common Stock Number Of Shares [Line Items]
Balance as of beginning-of-year		226,335,105	243,835,893
Stock issued for exercise of warrants		45,294	24,813
Stock compensation/issued for benefit plans		1,371,831	660,605
Retirement/cancellation of shares		(2,863,971)	(5,516,059)
Balance as of end-of-period		224,888,259	239,005,252

[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 in our 2016 Form 10-K.