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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