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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 | 218,090,114 | 226,335,105 |
Common Stock [Member] |  |  |
Changes In Preferred And Common Stock Number Of Shares [Line Items] |  |  |
Balance as of beginning-of-period | 226,335,105 | 243,835,893 | 256,551,440
Stock issued for exercise of warrants | 344,901 | 79,397 | 1,168,966
Stock compensation/issued for benefit plans | 1,793,234 | 1,732,812 | 2,108,155
Retirement/cancellation of shares | (10,383,126) | (19,312,997) | (15,992,668)
Balance as of end-of-period | 218,090,114 | 226,335,105 | 243,835,893
Common stock as of end-of-period: |  |  |
Basic basis | 218,090,114 | 226,335,105 | 243,835,893
Diluted basis | 221,309,830 | 230,126,820 | 247,732,609

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