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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Billions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Feb. 28, 2019
Stockholders Equity [Abstract]            
Percentage of increase to quarterly dividend 12.50%       12.50%  
Common stock dividends, rate per share $ 0.09 $ 0.08 $ 0.08 $ 0.06    
Share Repurchase Program [Member]            
Stockholders Equity [Abstract]            
Share-repurchase program, additional authorized amount     $ 3.0     $ 1.0
Share-repurchase program expiration date         Dec. 31, 2019  
Share Repurchase Program [Member] | Maximum [Member]            
Stockholders Equity [Abstract]            
Share-repurchase program, authorized amount       $ 1.0   $ 5.0