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Shares and Stockholders' Equity (Changes In Common stock (Number Of Shares)) (Details) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 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 | 189,089,948 |  | 189,089,948 |
Common stock as of End-of-Year |  |  |  |
Basic basis | 189,089,948 | 193,247,103 | 189,089,948 | 193,247,103
Diluted basis | 191,389,750 | 193,962,833 | 191,389,750 | 193,962,833
Common Stock [Member] |  |  |  |
Changes In Common Stock (Number Of Shares) [Line Items] |  |  |  |
Balance as of beginning-of-year | 191,149,192 | 193,208,244 | 192,329,691 | 196,668,532
Stock compensation/issued for benefit plans | 171,688 | 38,859 | 882,826 | 388,495
Retirement/cancellation of shares | (2,230,932) |  | (4,122,569) | (3,809,924)
Balance as of end-of-year | 189,089,948 | 193,247,103 | 189,089,948 | 193,247,103

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