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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
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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.

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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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