Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		6 Months Ended		149 Months Ended
	Jul. 15, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Aggregate Board of Directors repurchase authorizations (in $ millions)		$ 0	$ 1,500	$ 5,366
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 1,100		$ 1,100
Common stock, par value		$ 0.0001		$ 0.0001	$ 0.0001
Subsequent Event
Class of Stock [Line Items]
Aggregate Board of Directors repurchase authorizations (in $ millions)	$ 500
Common Stock, Dividends, Per Share, Declared	$ 0.62
Dividends, Common Stock, Cash	$ 73