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Shares and Stockholders' Equity (Changes In Common stock (Number Of Shares)) (Details) - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Changes In Common Stock (Number Of Shares) [Line Items] |  |  |
Balance as of beginning-of-year | 205,862,760 |  |
Balance as of end-of-period | 196,668,532 | 205,862,760 |
Common Stock [Member] |  |  |
Changes In Common Stock (Number Of Shares) [Line Items] |  |  |
Balance as of beginning-of-year | 205,862,760 | 218,090,114 | 226,335,105
Stock issued for exercise of warrants | 258,633 | 212,670 | 344,901
Stock compensation/issued for benefit plans | 942,318 | 800,325 | 1,793,234
Retirement/cancellation of shares | (10,395,179) | (13,240,349) | (10,383,126)
Balance as of end-of-period | 196,668,532 | 205,862,760 | 218,090,114
Common stock as of End-of-Period |  |  |
Basic basis | 196,668,532 | 205,862,760 | 218,090,114
Diluted basis | 199,196,043 | 209,034,686 | 221,309,830

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