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Shares and Stockholders' Equity (Changes In Preferred And Common stock (Number Of Shares)) (Details) - shares
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Changes In Preferred And Common Stock Number Of Shares [Line Items]        
Balance as of beginning-of-period     226,335,105  
Balance as of end-of-period 219,544,618   219,544,618  
Common stock as of end-of-period:        
Basic basis 219,544,618 228,529,287 219,544,618 228,529,287
Diluted basis [1] 222,701,021 231,421,682 222,701,021 231,421,682
Common Stock [Member]        
Changes In Preferred And Common Stock Number Of Shares [Line Items]        
Balance as of beginning-of-period 222,237,262 232,784,691 226,335,105 243,835,893
Stock issued for exercise of warrants 2,464 16,767 337,394 54,915
Stock compensation/issued for benefit plans 139,179 46,267 1,600,465 716,409
Retirement/cancellation of shares (2,834,287) (4,318,438) (8,728,346) (16,077,930)
Balance as of end-of-period 219,544,618 228,529,287 219,544,618 228,529,287
[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 this guidance. For more information, see Note 1 - Earnings Per Share in our 2016 Form 10-K.