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Stockholders' Equity (Summary Of Dividends Paid On Common Stock) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Stockholders Equity Note [Abstract]            
Common stock dividends paid, Amount $ 37 $ 34 $ 42 $ 32 $ 71 $ 74
Common stock dividends, rate per share $ 0.09 $ 0.08 $ 0.08 $ 0.06