Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions			9 Months Ended		164 Months Ended
	Oct. 20, 2021	Jul. 14, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Aggregate Board of Directors repurchase authorizations (in $ millions)		$ 1,000	$ 1,000	$ 500	$ 6,866
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 1,300		$ 1,300
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	$ 74