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Shares and Stockholders' Equity (Changes In Common stock (Number Of Shares)) (Details) - shares | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Changes In Common Stock (Number Of Shares) [Line Items] |  |
Balance as of beginning-of-year | 192,329,691 |
Balance as of end-of-year | 191,149,192 |
Common stock as of End-of-Year |  |
Basic basis | 191,149,192 | 193,208,244
Diluted basis | 192,464,319 | 195,027,909
Common Stock [Member] |  |
Changes In Common Stock (Number Of Shares) [Line Items] |  |
Balance as of beginning-of-year | 192,329,691 | 196,668,532
Stock compensation/issued for benefit plans | 711,138 | 349,636
Retirement/cancellation of shares | (1,891,637) | (3,809,924)
Balance as of end-of-year | 191,149,192 | 193,208,244

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