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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 158 Months Ended
Apr. 14, 2021
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Class of Stock [Line Items]          
Aggregate Board of Directors repurchase authorizations (in $ millions)   $ 0 $ 0 $ 5,866  
Common stock, par value (in dollars per share)   $ 0.0001   $ 0.0001 $ 0.0001
Subsequent Event          
Class of Stock [Line Items]          
Common Stock, Dividends, Per Share, Declared $ 0.68        
Dividends, Common Stock, Cash $ 77