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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, 2022 | Mar. 31, 2021
Changes In Common Stock (Number Of Shares) [Line Items] |  |
Balance as of beginning-of-year | 177,193,515 |
Balance as of end-of-year | 171,890,974 |
Common stock as of End-of-Year |  |
Basic basis | 171,890,974 | 191,149,192
Diluted basis | 173,761,296 | 192,464,319
Common Stock [Member] |  |
Changes In Common Stock (Number Of Shares) [Line Items] |  |
Balance as of beginning-of-year | 177,193,515 | 192,329,691
Stock compensation/issued for benefit plans | 514,855 | 711,138
Retirement/cancellation of shares | (5,817,396) | (1,891,637)
Balance as of end-of-year | 171,890,974 | 191,149,192

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