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Stockholders' Equity (Summary Of Dividends Paid On Common Stock) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Stockholders Equity [Line Items]    
Dividends amount $ 596 $ 667
Dividends rate per share $ 0.89 $ 1.00
Fixed Dividend [Member]    
Stockholders Equity [Line Items]    
Dividends amount $ 133 $ 109
Dividends rate per share $ 0.20 $ 0.16
Variable Dividend [Member]    
Stockholders Equity [Line Items]    
Dividends amount $ 463 $ 558