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Shares and Stockholders' Equity (Changes In Common stock (Number Of Shares)) (Details) - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 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 | 186,089,222 |  | 186,089,222 |
Common stock as of End-of-Year |  |  |  |
Basic basis | 186,089,222 | 193,254,948 | 186,089,222 | 193,254,948
Diluted basis | 188,103,623 | 195,331,049 | 188,103,623 | 195,331,049
Common Stock [Member] |  |  |  |
Changes In Common Stock (Number Of Shares) [Line Items] |  |  |  |
Balance as of beginning-of-year | 189,089,948 | 193,247,103 | 192,329,691 | 196,668,532
Stock compensation/issued for benefit plans | 61,099 | 7,845 | 943,925 | 396,340
Retirement/cancellation of shares | (3,061,825) |  | (7,184,394) | (3,809,924)
Balance as of end-of-year | 186,089,222 | 193,254,948 | 186,089,222 | 193,254,948

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